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Topic: Passivation


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  Passivation Tester 2026
The passivation bath, usually nitric acid, cleans off surface free iron which causes rust spots and conditions the surface for the spontaneous formation of protective surface oxides.
In effect, an equipotential surface is formed by passivation.
This portable, light-weight instrument measures the corrosion tendency of the surface of stainless steels.
www.koslow.com /2026.html   (368 words)

  
  Astro Pak Corporation - High Purity Cleaning and Passivation
Astro Pak is the worldwide leader in precision cleaning and passivation of high purity gas and fluid systems.
Critical cleaning and passivation is an integral part of system preparation and maintenance.
Passivation pump skid with filtration, flow control, heat exchanger, temperature and flow gauges, and mix tank
www.astropak.com /o_high_purity_cleaning.php   (380 words)

  
  Pickling and Passivation
Both pickling and passivation are chemical treatments applied to the surface of stainless steel to remove contaminants and assist the formation of a continuous chromium-oxide, passive film.
Passivation is the treatment of the surface of stainless steels, often with acid solutions (or pastes), to remove contaminants and promote the formation of the passive film on a freshly created surface (eg through grinding, machining or mechanical damage).
Passivation does not usually result in a marked change in appearance of the steel surface.
www.assda.asn.au /asp/index.asp?pgid=17977   (620 words)

  
 |: Passivation :|: IMAGINEERING Metal Finishing Technologies :|: South Bend, Indiana, USA :|
To remove free iron or sulfides from the surface of a part, surface finishers passivate (immunize) the component using a variety of different solutions containing nitric acid and oxidizing salts.
Passivation (immunization) is used in a variety of industries to include aerospace fuel system controls, medical implants, marine fasteners, and drive components for computers.
The use of passivation is relatively inexpensive and enhances the life of the component.
www.iftworldwide.com /solutions/passivation.htm   (323 words)

  
  Passivation
Passivation is the removal of free iron from the surface of stainless steel equipment using chemical dissolution.
All passivation is performed in compliance with ASTM standards.
Passivation can be performed on virtually any stainless steel item, from intricate parts to large tanks and pressure vessels.
www.pharmaceuticalonline.com /Content/ProductShowcase/product.asp?DocID={AB396896-50DC-4E75-8FDD-4202BE01F4F7}   (126 words)

  
 Electrochem - Support - Technical Information - Passivation
Passivation is a phenomenon of liquid cathode lithium cells related to the interaction of the metallic lithium anode and the oxyhalide electrolyte.
A thin passivation layer forms on the surface of the anode at the instant the electrolyte is introduced into the cell.
A passivated cell may exhibit voltage delay, which is the time lag that occurs between the application of a load on the cell and the voltage response.
www.electrochempower.com /support/technicalinformation/passivation.htm   (561 words)

  
 Stainless Steel Passivation from Electro Max, Inc.
Passivation of stainless steel is not electroplating, it is a non-electrical process whereby the free iron is chemically removed from the surface of stainless steel.
Passivation removes exogenous iron or iron compounds from the surface of a stainless steel by means of a chemical dissolution that will remove the surface contamination but will not significantly affect the stainless steel itself.
Passivation is the process by which a stainless steel will spontaneously form a chemically inactive surface when exposed to air or other oxygen-containing environments.
www.electromax-inc.com /passivation.htm   (236 words)

  
 JAVA GLOSSARY, Activation, Passivation , EJB callback methods
Passivation is the act of disassociating a stateful bean instance from its EJB object and saving its state.
Passivation requires that the bean instance’s state be held relative to its EJB object.
After the bean has been passivated, it is safe to remove the bean instance from the EJB object and evict it from memory.
www.allapplabs.com /glossary/passivation.htm   (301 words)

  
 PF Online Feature Article - Passivation of Stainless Steel
Passivated parts are immersed in a copper sulfate solution for six min, rinsed and visually examined.
It boils down to a basic understanding that the passivation process is both an art and a science, and that machining, fabricating and heat treating practices can substantially affect the corrosion resistance of the component.
Passivation will enhance the corrosion resistance of stainless steels, but to realize the maximum performance from these high-tech alloys, all parties involved with manufacturing must understand their responsibility in maintaining the integrity of the material throughout the process.
www.pfonline.com /articles/119806.html   (1513 words)

  
 Superior Shot Peening, Inc. | Shot Peening, Metal Surface Treatment & Protective Coatings - Houston, Texas
Passivation is a cleaning and corrosion-protection treatment appropriate for a variety of machined metals.
Although it is useful for many types of metals, passivation is particularly popular as a method of cleaning the impurities left on the surface of stainless steel after the manufacturing process.
During passivation, the steel or other metal is treated with an acid solution which removes contaminants from the metal surface and which coats the surface in a protective film.
www.superiorshotpeening.com /treatments-passivation.htm   (264 words)

  
 Passivation   (Site not responding. Last check: )
Passivation agents delay the formation of zinc oxides and hydroxides until such time as it is safe, as determined by environmental and/or storage conditions.
Once the passivating agent is gone (usually after six weeks or so), galvanized steel begins to form its protective zinc patina.
Chromate passivations sometimes are used on galvanized reinforcing bar to control reactions between zinc and concrete while the concrete cures, particularly the hydrogen evolution that may affect bonding properties.
www.galvanizeit.org /showContent,176,218.cfm   (291 words)

  
 Stainless Steel Electropolishing and Passivation from Allbright
Passivation refers to the chemical neutralization of the surface - increasing corrosion resistance.
This is referred to as a chromium enriched surface oxidizing to form a chromium oxide Passivation layer.
All of the specimens passivated conventionally (nitric acid at varying temperatures and concentration) showed a considerable amount of rust after 8 hours and were removed from the test while the Electropolished specimens did not show any change until after 40 hours.
www.all-bright.com /passivation.html   (788 words)

  
 The passivation process provides protection to stainless steel against iron contamination
Passivation treatments improve the surface condition of stainless steel by dissolving iron that has been im- bedded in the surface during forming or machining.
Passivation, which consists of immersing stainless steel components in a solution of nitric acid without oxidizing salts, will dissolve the imbedded iron and restore the original corrosion-resistant surface by forming a thin, transparent oxide film.
Verifies the Passivation process on all grades of stainless steel, with the exception of 440C.
www.electrohio.com /Plating/Passivation.htm   (297 words)

  
 Post-plating passivation treatment - Patent 5182172
Passivation, as the term is used in connection with the present invention, is defined as the process of pore and surface layer sealing.
Passivation is commonly practiced in the electroforming industry on a large scale.
The ammonium dichromate is particularly desirable for use in the instant passivation invention due to the less aggressive nature of the ammonium cation, should it become entrapped in the gold pores.
www.freepatentsonline.com /5182172.html   (3654 words)

  
 Passivation Of Stainless Steel, Electro-Coatings, Inc.
In lay terms, the passivation process removes "free iron" contamination left behind on the surface of the stainless steel from machining and fabricating.
Nitric acid concentration in the 20 to 50% by volume range is generally specified in the passivation process.
A thorough knowledge of the material types and passivation processes is paramount to achieving the desired results.
www.electro-coatings.com /passivating.html   (255 words)

  
 Stainless Steel Passivation - Citric Acid Passivation - Delstar Electropolishing Passivating and Mechanical Polishing
Passivation is performed when free iron, oxide scale, rust, iron particles, metal chips or other nonvolatile deposits might adversely affect the metallurgical or sanitary condition or stability of the surface, the mechanical operation of a part, component or system, or contaminate the process fluid.
Passivation is the chemical treatment of a stainless steel surface with a mild oxidant such as citric acid passivation solution.
Passivation is the removal of exogenous iron or iron compounds from the surface of stainless steel by means of a chemical dissolution, most typically by a treatment with an citric acid passivation solution that will remove the surface contamination but will not significantly affect the stainless steel itself.
www.delstar.com /passivating.htm   (589 words)

  
 |: Passivation :|: IMAGINEERING Metal Finishing Technologies :|: South Bend, Indiana, USA :|
In lay terms, the passivation process removes “free iron”; contamination on the surface of stainless steel from machining and fabricating.
Passivation (immunization) is used in a variety of industries to include aerospace fuel system controls, medical implants, marine fasteners, and drive components for computers.
The use of passivation is relatively inexpensive and enhances the life of the component.
www.imagineering-inc.com /solutions/passivation.htm   (323 words)

  
 11772. Testing for Passivation
Passivation is a process of first removing as much of the iron (and other materials) from the surface of stainless steel as possible.
The main indication of passivation (transition of metal from active to passive state) is a sharp decrease in speed of metal dissolving, and visible shift of metal potential towards positive.
It is a common assumption that passivity is determined by existence of thin oxide (hydroxide) film, which separates metal from the environment.
www.finishing.com /117/72.shtml   (1210 words)

  
 Stellar Solutions - Citric Acid Passivation
The CitriSurf™ citric acid cleaning and passivation process is based on a new technology using safe and environmentally friendly citric acid to remove the free iron from the surface of stainless steel and chromium enrich the surface.
There is not agreement in industry as to exactly how the passive layer works, but it is generally agreed that the outer layer after passivation consists of only oxides of chromium and iron or nickel which are highly resistant to corrosion.
It is critical, therefore in passivating stainless steel that the material is very clean and absent of free iron to form the passive layer upon oxidation.
www.stellarsolutions.net /wave.htm   (979 words)

  
 Excell Battery Company
In most cases, passivation is not a factor in cell performance, and in those cases that passivation becomes an issue, simple steps can be undertaken to overcome the effects.
Passivation is a very thin, high resistant layer formed in a cell between the lithium anode and the carbon based cathode of a lithium cell.
An advantage of the passivation layer is it allows the battery to have a very low self discharge rate and extremely long shelf life.
www.excellbattery.com /passivation.htm   (509 words)

  
 Semi-conductor device with sandwich passivation coating - Patent 4692786
In this respect, the electrical characteristics of the passivation coating are significant, since the insulative and capacitance values of this coating are factors in circuit design.
The nitride-silica passivation coating is then etched to expose portions of the semi-conductor area on the silicon chip, in which the titanium tungsten sublayer and then the aluminum overlayer are deposited.
The thickness of the outer silica layer in the sandwich composite passivation coating is determined by the total silica required (in the inner and outer silica layers) to meet design requirements, i.e.
www.freepatentsonline.com /4692786.html   (2303 words)

  
 Passivation
After the device is made, a passivation layer is put on top to passivate it.
Silicon nitride is often used as a final passivating or protective layer for silicon devices.
Passivation is accomplished with a chemical vapor deposition process using silane and ammonia gases.
www.rit.edu /~sdrl/passivation.html   (79 words)

  
 New Developments In Passivation Technology
Passivation can be thought of as a specialized cleaning procedure in which "rustable" iron and other contaminants are removed from the surface to provide a chromium rich surface layer.
Before chemically treating the metal surface to achieve passivity, the metal surface is submitted to a "smoothing" or polishing operation for the purpose of reducing surface roughness.
Passivation formulations will continue to improve as new instrumental techniques are employed to select the best products.
www.chemicalonline.com /content/news/article.asp?docid={b09b67d2-a835-11d3-9a74-00a0c9c83afb}   (1698 words)

  
 Stainless Steels - Passivation of Stainless Steels
The primary purpose of a passivating treatment is to remove surface contamination so that the optimum corrosion resistance of stainless steel will be maintained.
Passivation is not a scale removal treatment and it is generally desirable to pickle fabricated stainless steel prior to placing it in service.
Passivation should be preceded by degreasing followed by a thorough water rinse.
www.azom.com /details.asp?ArticleID=2536   (241 words)

  
 PF Online Feature Article - Passivation of Stainless Steel   (Site not responding. Last check: )
Passivation should only be performed by trained, experienced technicians familiar with the potential hazards associated with the science.
Perhaps the most overlooked variable in the entire passivation equation is the negative impact of poor machining and heat treating practices.
Passivation is not designed to remove discoloration and will not penetrate heavy oxide layers.
www.p2pays.org /ref/19/18084.htm   (1527 words)

  
 Keeping stainless steels stainless: How important is passivation for SS?
Thus, passivation may refer to the chemical removal of free iron or iron compounds from the surface, or it may refer to the spontaneous development of a chemically inactive surface (protective oxide film) on the stainless steel.
Passivation typically is accomplished either through an appropriate bright annealing of the stainless steel or by subjecting the surface to an appropriate chemical treatment.
Passivation results in the formation of an oxide film having a higher chromium-to-iron ratio than the underlying stainless steel because of the preferential oxidation of chromium and the preferential dissolution of iron.
www.thefabricator.com /TubePipeProduction/TubePipeProduction_Article.cfm?ID=888   (1571 words)

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