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작성자동다방 조회 3회 작성일 2022-08-18 01:46:16 댓글 0

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Electropolishing Stainless Steel

#electropolishing #stainlesssteel

Electropolishing is an electrochemical process often referred to as “reversed plating”. Electropolishing removes material at a controlled rate and can be controlled to .0002” accuracy. Electropolishing stainless steel will help to restore the natural corrosion resistance of stainless steel, improve surface finish, enhance aesthetics, and make products easier to clean and sterilize.

The Electropolishing Process

Electropolishing stainless steel involves the racking of parts, then immersing them into a temperature-controlled bath of electrolyte which is composed of a mixture of sulfuric acid and phosphoric acid. Parts are positively charged during electropolishing using DC power. The electrolyte acts as a conductor and a small amount of metal is dissolved off the parts’ surface. The process leaves behind a clean, smooth, and passivated surface. Parts are then subjected to multiple rinsing steps to ensure any residual electrolyte is removed before the parts are dried, inspected and packaged for shipping.

Passivation vs. Electropolishing

A material is considered passivated when it can demonstrate a high resistance to corrosion in an environment where you would expect corrosion to take place. There are multiple means to accomplish the passivation of stainless-steel products and components. Passivation can be achieved through chemical processes like nitric acid passivation and citric acid passivation, or it can also be achieved through electropolishing.

The chromium in stainless steel forms a thin, oxygen enriched, passive layer on the surface of the metal. This layer is what makes stainless steel resistant to corrosion. Manufacturing process such as machining, cutting, stamping, and welding will disrupt the passive layer and embed free iron and impurities into the surface layer of the metal. These impurities lead to corrosion if left untreated.

Learn more at https://neelectropolishing.com/electropolishing-stainless-steel/
ankit kumar singh : You are using chemical for phosphoric and sulfuric chemistry or other things ?
Minh Đoàn Thế : Good Job
ankit kumar singh : Citric acid is good for passivation ? Better' improvement than nitric process
Abderrahmane Boumala : Sir can have your contact?
Alexis Fgt : Nice work in t-shirt

why stainless steel doesn't rust.

what makes stainless steel stainless and why stainless steel doesn't rust. This video will explain how chromium form passive layer on stainless steel.

Chromium is the key and powerful ingredient of stainless steel.Chromium is the main element who protects the steel from corrosion.

In 1797, the French chemist Louis Nicholas, discovered the chromium oxide, in an ore of “red lead” from Siberia.

The name of the element is derived from the Greek word chromos, meaning color, after observing that, the most of the compounds of chromium has a variety of colors.

In 1908, A German researcher, Philip Monnartz studied the effect of carbon content on the corrosion resistance of high-chromium steels.

His research showed that, the passive layer of chromium oxide is responsible for this great increase in corrosion resistance. In 1911, he published his work on this subject in Metallurgy, entitled “The Study of Iron-Chromium Alloys with Special Consideration of Their Resistance to Acids.”

Philip Monnartz was the first, who have pointed out the significance of chromium in steel alloy. He mentioned that, at least 12% chromium by weight is required in a steel alloy to be a stainless steel.

Till now you have understood that, chromium forms a protective oxide layer which protects the steel from corrosion. But how this passive layer is formed.

This passive oxide layer forms naturally when stainless steel is exposed to air. However, this chromium oxide layer formed in this way may not be uniform. This is because of presence of free ions and impurities on the free surface of stainless steel.

So a chemical treatment, known as passivation is carried out to make uniform passive chromium oxide layer. Now you may be thinking, what is passivation.

Passivation is a chemical process, which removes free iron from the surface of a stainless steel component, and at the same time promotes the formation of a thin, chromium oxide passive layer. The chromium oxide passive layer act as protective barrier against corrosive environment.

This passive film on stainless steels is composed of an outer iron-rich oxide, mainly Fe2O3 and iron hydroxide like Fe(OH)2 and Fe(OH)3. And an inner chromium-rich oxide, often stated as Cr2O3 and Cr(OH)3, with some molybdenum as well as silicon species.

The presence of chromium increases the stability of the oxide layer, since it has higher affinity for oxygen than does the iron. The chromium content in the passive film is dependent on both the concentration of the chromium in the base metal alloy and the exposure time to the passivating solution. often nitric acid has been used as passivating solution.

The Low carbon content is important, since excess carbon forms free carbides, which prevents passivation.

Chromium also forms variety of chromium carbide in steels. These carbides are very hard and improve wear resistance of steel. Thus, in addition to corrosion resistance chromium also improves wear resistance of stainless steel.

hope you find this information helpful.

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thank you

Introduction 0:03
History of chromium 0:10
Why stainless steel doesn't rust 0:28
what makes stainless steel stainless 0:28

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Sina Fadakhah : thanks for helping me.
Hans de Groot : It does rust

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