Mots-Clés ‘Passivation of stainless steel’

Stainless steel maintenance

Lundi 22 octobre 2012

The modern world is filled with Many marvels, and scientific and medical Within the fields there are different Numerous Areas of study, all working to Improve the quality of our lives. While they’ll all Somewhat Differ in Their terms of processes and Their goals, most is have some things in common. Among Them, the use of equipment and materials That Are made from stainless steel and other metals is one of the common threads. These tools, surfaces, and equipment all need to be kept in top condition in terms of cleanliness, smoothness, and chemical non-reactivity. In order to do that, special steps must be taken Usually. Basically, the act of making a stainless steel surface passive in terms of reactivity to chemicals icts is known as passivation. By Treating the steel through a multi-step process the steel will be neutral Essentially falling on Any experiments or tests it is used for. This is a totally neutral When vital area is needed – surfaces react with a compound That Could Negatively alter results and render all data gleaned from a study invalid. The process must be completed is totally clean, descaled surfaces and is fairly easy for Experienced professionals to complete. It’s been Commonly Performed Daily Basis, and is one of the backbones of the research community.

It’s important to Understand the différence entre to this process and the act of electropolishing. In some instances the two are identical, purpose in the other boxes polishing will not remove Necessarily the reactivity of the surface. Thesis in a different process instances is used and the results are basically the removal of scale, removal of corrosion and prevention of corrosion. It can render a également area much smoother and more suitable for different tasks. When used as share of a multi-step process it can passivate surfaces and prepare em for experiments.

Basically, thesis processes are required for Any Facility That Utilizes stainless steel or other materials, Particularly Those That require perfectly smooth, totally nonreactive surfaces. It’s not something you can just go rent a machine for, either. You’ll have to hire a professional to Actually handle the process for you and make safe That you get the best results. Their professional expertise and Their tools will Ensure That All of your surfaces are in top shape and are ready to go Whenever you need ‘em. Routine maintenance procedures Involving two thesis is absolutely vital for MOST facilities, and Easier to find than you may think.

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Passivation of stainless steel – Cleaning Up

Lundi 17 septembre 2012

Passivation of stainless steel - Cleaning Up dans Electropolishing

Astro Pak Corp.’s first customers, and for decades its biggest, were the Southern California aerospace companies building the rockets and command modules that shot astronauts to the moon.

But a more recent customer had more terrestrial rides in mind: Astro Pak has worked on several attractions at Disneyland, including the Indiana Jones ride, Ariel’s Undersea Adventure, and the recently opened Cars Land at Disney’s California Adventure.

Founded in Downey in 1959, Astro Pak specializes in passivation and precision clearing of sensitive and high-tech parts, from the satellite components to nuts and bolts used in jet engines.It still handles parts for aerospace companies at its Downey clean room, but most of the company’s work is now in other industries, from electronics to pharmaceuticals, and yes, even amusement parks.

That broad range of offerings has helped Astro Pak do what many Southern California aerospace contractors have failed to do over the past few decades: stay in business and grow.

In fact, the company this year opened an expanded clean room in Downey and a new clean room in Chesapeake, Va., to meet growing demand for its precision cleaning services.In fact, despite booms and busts, the company said it now has about five times the revenue and four times the workers it employed before the fall of the Soviet Union.

“If we hadn’t diversified, we have gone out of business at the end of Apollo and again at the end of the Cold War.You have to have enough diversity to balance the ebbs and flows,” said Ken Verheyen, Astro Pak owner and president.

Today, aerospace customers represent only about 10 percent of Astro Pak’s business –about the same percentage of as water and wastewater treatment customers.Most of the company’s business is in the pharmaceutical and biotech industries.

By contrast, many small aerospace firms that were never able to expand their offerings were closed, acquired or downsized, laying off thousands of employees.Los Angeles County had 189,000 aerospace workers in 1990, a number that gradually shrank by nearly 70 percent to 59,700 by 2010, according to the Los Angeles County Economic Development Corp.

Race from space

Such losses are likely to continue, if not accelerate, as the Department of Defense cuts billions from its budget.Those cuts will be especially hard on small companies with narrow offerings, said Kimberly Ritter-Martinez, an associate economist with the LAEDC.

“As the aerospace industry has gone through ups and down, smaller suppliers and contractors have been a lot more sensitive to Pentagon budget cuts,” Ritter-Martinez said.“Unlike Northrop and Boeing, they don’t have a broad mix of products.They’ve had more trouble diversifying.”

When it was founded in Downey in 1959, Astro Pak worked exclusively on projects related to the U.S. space program.Parts going into the lunar lander, the Apollo command capsule and other space-bound equipment had to be free of oils and particles that could cause delicate equipment to break down.

Passivation That meant cleaning parts at Astro Pak’s Downey clean room and dispatching workers to launch sites to clean fuel lines.But as the Apollo program started to wind down in the 1970s, Astro Pak founded itself looking for more work.The company found it with Navy contracts, cleaning parts for deep-diving and salvage equipment.This was big business –until the early ‘90s.

“At the end of the Cold War, the Navy’s diving capability was substantially reduced.That was almost like a light switch of revenue that turned off,” Verheyen said.

Today, the company still does aerospace and defense work, such as cleaning parts of a new rocket engine being developed by Canoga Park’s Pratt & Whitney Rocketdyne, but it has put its precision-cleaning know-how and its clean-room facility to good use in growing high-tech industries.

It first breakthrough was in the biotech and pharmaceutical industries.Verheyen said it was difficult for the company, unknown outside of the aerospace sector, to attract customers.So rather than sell customers on the company’s aerospace heritage and capabilities, Verheyen created an internal team to figure out what biotech and pharmaceutical customers needed and to build a fresh marketing approach.

“Customers are dying to have people really focus on and understand the requirements of what they need,” he said.“Oftentimes, companies come in and slightly adapt what they’re doing somewhere else and miss the true need of the industry.”

LAEDC’s Ritter-Martinez said Astro-Pak’s much broader portfolio is a rarity among firms formerly dependent on aerospace, but she also noted that it has likely been easier for Astro Pak, a service provider, to reach into new markets than it would be for other companies, especially manufactures.

While Astro Pak once specialized in aerospace work, its cleaning procedures could be adapted relatively easily to other products and industries without investing much new capital or hiring new talent.That’s a more difficult transition for companies that make specific widgets that go into a satellite or a jet.

“A small supplier might have just one or a handful of products,” Ritter-Martinez said.“If you’re a manufacturer and all your machinery is geared toward making a product for Boeing, you’re kind of locked in with one large customer.”

Even for companies that make products that can be used in other industries, it’s still difficult for small firms to find customers outside of the largely insular aerospace sector, said Erin Dyer, quality control manager for Glendale parts maker Accurate Dial & Nameplate Inc.

The company, which makes serial number badges and faceplates for machinery, sells mostly to aerospace manufacturers and wants to grow into the rail car and wind turbine markets.But it has no marketing department or outside sale force to reach out to those customers.

“We’ve built our business on referral and our good reputation,” Dyer said.“We only have 21 employees.The hardest part is taking time from your daily duties to create marketing materials so you can introduce your company to new customers.”

Big portfolio

Nevertheless, Astro Pak’s diversification didn’t stop with biotech and pharmaceuticals, though those industries now supply about 65 percent of the company’s revenue.

Verheyen said the company is getting more contracts in the food and beverage industry.Astro Pak recently started working on a cleaning project for Modesto’s E&J Gallo Winery.

The company also has occasional work in other industries.It was recently contracted to clean ore-processing systems at a gold mine in the Dominican Republic and does occasional work for Disneyland, where it flushes hydraulic lines that control several rides and attractions.

“Those are high-purity systems.You have to make sure they’re extremely clean,” said Jerry Knepper, Astro Pak’s vice president of sales.“It could damage the pumps if particles (in the lines) are too big.”

Much of Astro Pak’s work is performed at the customer’s location, where a field team might clean and flush lines that transfer chemicals within a pharmaceutical plant.But its largest employment base remains in Downey, where 50 of its 190 employees work.(Executive offices were moved to Costa Mesa several years ago.)

The company’s most recent business line is in sterilizing hospital rooms and surgical suites.Astro Pak in 2010 created a separate company, SixLog Corp., that uses a kind of aerosolized hydrogen peroxide to kill bacteria and other biological contaminants in rooms and on equipment.

“I can’t remember having a slow year here,” Verheyen said.“Our revenue is up 20 percent this year to date.That’s stinking healthy.”

Electropolishing vs. Passivation

Mardi 21 août 2012

What is electropolishing and how is it different from passivation? Electropolishing is an electrolytic process that expels contaminants from metal parts for cleanliness while preventing particles from adhering. Electropolishing, a non-mechanical process, is ideal in metal finishing because it can be used on objects with complex shapes. Passivation is a non-electrolytic process that removes iron from stainless steel surfaces to prevent rust and corrosion. As a non-electrolytic process, passivation does not require the usage of an electrical current. Solutions like citric and nitric acids are used instead to create a film and remove free iron and foreign matter from metal surfaces. Electropolishing and passivation are two different approaches in eliminating and preventing rust and corrosion on metal surfaces.

Electropolishing involves the process of using electrochemical finishing techniques to obtain a corrosion-resistant finish for metals and alloys. Essentially, electropolishing is a technique where a combination of chemicals and an electrical current is utilized to carefully eliminate imperfections and contaminants of metal part surfaces. This particular process is an alternative to abrasive fine polishing. Your washing machine’s stainless steel drum or surgical steel devices are examples of electropolished surfaces. Electropolishing can be used to polish, deburr, and passivate metal components. Many benefits can be observed with electropolishing including: outstanding finished appearance, corrosion-proof surface, surface smoothness, reduced maintenance costs, and enhanced cleanability.

PassivationPassivation, on the other hand, is a chemical process applied to stainless steel surfaces. During machining, stainless steel may cause imperfections from iron being embedded or smeared onto the surface. Since iron corrodes, the stainless steel surface, if left untouched, will cause rust spots to appear. A corrosive reaction can occur between the two different metals but the condition can be negated with passivation. Passivation allows stainless steel surfaces to be more passive and resistant to corrosion. To make the stainless steel area more passive, a “film” is created so that surface loses chemical reactivity. When exposed to air, the stainless steel undergoing passivation will form a chemically inactive surface. Many benefits can be observed through passivation like sanitary and safety. Passivation is a highly desired process because it produces a low corrosion rate in stainless steels.

Using a combination of electropolishing and passivation will allow metals to obtain the ultimate corrosion-resistant and shiny surface. Not only does electropolishing for metals and alloys produce a surface finishing resistant to corrosion, enhanced durability, improved performance, and a smoother and aesthetically pleasing surface can gained from this electrolytic process. Passivation, on the other hand, is not an effective method for removing surfaces that has been welded or heat treated. In other words, passivation does not change or brighten the metal’s appearance—it will only give surfaces a clean finish. Electropolishing would be the more appropriate approach when aesthetics are necessary.

Protecting Metal with Electro Polishing

Mercredi 11 juillet 2012

When processing steel parts or machinery, it’s important to protect them from corrosion. This can be done with the process of passivation. This involves making a surface more passive, through a variety of different possibilities. For example, this could be achieved by creating a surface film that causes the surface to lose its ability to have chemical reactions. One of the methods that can lead to a passive surface is electropolishing. These types of processes are performed when the metal is subject to iron particles, metal chips, oxide scale, or other forms of deposits which could impact the stability of the metal’s surface. Other negative effects these could have include contaminating the process fluid or ruining the sanitary condition of the metal.

passivationTherefore, when you are preparing any metals to be used in manufacturing, passivation is necessary for sanitary and safety reasons. However, there are several different processes that can be used to make steel more passive. The end result of these processes must lead to the metal forming a chemically inactive surface. Electro polishing is an electrochemical process, which results in the most passive surface out of all the different processes out there. It is also known as electrolytic polishing, and it helps remove materials from any metallic work pieces.

If you are in need of a potent form of passivation, you might want to look into electro polishing as a result. Usually in this process, the metal work piece is first immersed in an electrolyte bath, which is then connected to a positive power suppl. At the same time, the negative terminal is attached to a cathode. An electrical current passes through this electro bath, which helps oxidize and dissolve the surface of the metal work piece. The electrolyte bath that is used can be composed of a variety of ingredients, typically sulfuric and phosphoric acid.

You can also use many other forms of passivation to achieve a smooth, clean metal surface that will be free from corrosion, but electro polishing is useful because of its numerous applications. It’s a fairly simple process that can be applied to many different types of shapes and sizes of metal. It is typically used for vacuum components, microscopy, and stainless steel surgical devices, among other types of professional work pieces. To find the right process for your needs, it’s best to compare the different options out there and ask questions before you choose the most efficient method of passivation.

What is Electropolishing?

Jeudi 21 juin 2012

On-Site and Shop Electropolishing

In addition to Astro Pak’s heritage in offering Passivation, Derouging and High-Purity & Precision Cleaning services for critical water and product systems – Astro Pak offers Electropolishing. Electropolishing

Astro Pak’s Electropolishing service provides optimal Ra (Roughness Average) finishes to your equipment, vessels, tanks and systems. The result is a microscopically flat, smooth and featureless surface which helps to enhance cleanability and appearance of stainless steel components, hardware and parts. Expert Polishing technicians will prepare the surface area for our Electropolishing process. The result is that we will meet or exceed the original specified finish, and match or eliminate existing grain.

The ability to Electropolish on-site enables us to repair, maintain or upgrade the required surface finish on the interior of production vessels and their associated equipment with minimal downtime. Our mobilization resources make immediate response possible to ensure timely remediation of vessels large or small, which may have been compromised by chemical attack or mechanical impact.

Let our experts resolve your surface treatment needs. As leaders in numerous market segments that require High Purity and Critical Precision Cleaning, several of our employees sit on committees and boards in such organizations as ISPE, ASME/BPE and others.

What is Electropolishing is a reverse plating process. Parts are fixtured onto a special rack or basket and then lowered into a specifically blended chemical bath. Electrical current is then applied to the part. Instead of adding to the surface imperfections such as impurities, burrs and other defects to be removed. The electropolishing process is monitored and refined to remove metal uniformly to customer specifications allowing great benefits on ultracleaning, microfinishing, and corrosion protection. Electropolishing processes

Astro Pak Advantage

·cGMP Documentation Package

·State-of-the-Art Polishing Equipment

·Custom Tooling

·Pick-up & Delivery

·Cleaning, De-rouging and Passivation Services

·Spot Polishing to Repair Welds, Alterations or other Damage

·Certified Confined Space Entry Technicians

Passivation for Protection, Nitric Acid Passivation for Strength

Jeudi 24 mai 2012

Corrosion is all around us; it can cause metal to rust, can lead to batteries leaking fluid, and can cause untold damage to vehicles, bridges or other structures. Passivation is the coating of a surface to prevent corrosion, and is used frequently in electronics. Some types of substances are naturally passive to corrosion, including aluminum, steel and nickel. Nitric acid passivation is a great way to use a common and useful chemical for a greater purpose. However, great care must be taken when using nitric acid, as this chemical can be extremely dangerous. It is not recommended that you use this at home.

Those that are interested in passivation, but also need to find ways to clean their metals often turn to nitric acid passivation techniques, as it will not remove the underlying strength of the metal itself, and nitric acid is a powerful cleaner. Nitric acid is used to test gold, can protect stainless steel from types of corrosion, and is very effective in passivation. However, there are many federal and state safety requirements that must be met when working with this chemical, as it can be toxic in the wrong conditions. Oxidizing the surface of metal requires a great deal of skill.

PassivationIn the search for the perfect Passivation technique that reduces corrosion without harming the metal; many companies turn to nitric acid passivation, as nitric acid is readily available. The corrosion of stainless steel has cost many industries millions of dollars, and passivation is a useful technique that can reduce the amount of waste caused by corrosion, and improve the strength of metal. Those in the metal industries rely upon ever-improving passivation methods, and have weighed the benefits of using nitric acid as opposed to other methods such as citric acid. Depending upon the ph levels of the metals, results may vary.

When it comes to cleaning the metal and using passivation, there are many sources that can help provide information. The EPA has done a great deal of research regarding the effectiveness of nitric acid passivation, and there are websites that can provide statistics and techniques. Engineers are able to use nitric acid for passivation techniques, and there are many engineer websites that publish their views on these methods. New products for passivation come out on the market all the time, so do your research and visit with the experts to find everything you ever wanted to know about this area of metallurgy.

Passivation and Medical Device Cleaning

Vendredi 27 avril 2012

Passivation,Passivation of stainless steel

Ultra Pass® passivation – Is to produce high surface chromium levels creating the best corrosion resistant passive surface. In physical chemistry and engineering, passivation is the material getting passive without being affected by environmental factors such as air or water. It is a technique that uses a light coat of material like metal oxide for creating a shell against corrosion. It helps to strengthen and preserve the appearance of metallic’s. Passivation is such a procedure that occurs in certain conditions and used in microelectronics for enhancing silicon. The procedure is done on materials like silicon, aluminum, stainless steel and nickel to make them more passive and resistant to corrosion.

Passivation is usually done by creating a surface film that causes the surface to lose its chemical reactivity. This causes the metal to corrode at much lower rate than its usual rate. In case of stainless steel, passivation occurs when free iron, oxide scale, rust, iron particles, metal chips and other non-volatile deposits start affecting the stability of the surface, the operation of a part, component or system contaminating the process fluid.

In the passivation of silicon, aluminum, stainless steel and nickel, the materials may spontaneously form a chemically inactive surface when exposed to air or other environments containing oxygen. Most often, passivation removes iron compounds from the surface of the material using a chemical dissolution that may contain citric acid solution.

The field of medical science uses various medical devices that are crucial to diagnose, monitor or treat different conditions. The devices follow rigorous safety standards and ensure the safety of the patients. Usually, the medical devices used may be categorized as

·Diagnostic. These are used to identify the disease and include ultrasound, MRI, X-ray, PET and CT scanners.

·Therapeutic. These help the patients during and after the surgery and include lasers, infusion pump and LASIK devices.

·Life support. These help a patient to maintain their body functions and include cardiovascular devices, ventilators, dialysis devices, ECMO and anesthetics.

·Monitors. These include EEG, ECG, etc. that help the surgeons to evaluate the state of the patient by keeping account of their blood pressure and pulses.

·Medical laboratory. These devices are used to analyze urine, blood and genes.

It is important to carry out medical device cleaning so that the devices provide long-term service and do not spread infection. Devices that are to be reused should be disinfected by cleaning them with a disinfectant solution. This helps to remove the smallest of the contaminant quantities. In case, of larger medical devices, one may take the services of service centers who specialize in such procedures.