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Laser cleaning machine to clean the oxide layer on the surface of stainless steel

Apr 27,2023 | TOPTEK

Stainless steel refers to steel that is resistant to weak corrosive media such as air, steam, and water, and chemically corrosive media such as acids, alkalis, and salts. Also known as stainless acid-resistant steel. In practical applications, the steel resistant to weak corrosion medium is often called stainless steel, and the steel resistant to chemical medium corrosion is called acid-resistant steel. Due to the different chemical composition of the two, the former may not be resistant to chemical media corrosion, while the latter is generally stainless. The corrosion resistance of stainless steel depends on the alloying elements contained in the steel.

After the surface of stainless steel is mechanically polished, if there is no other treatment, the new substrate on the surface will still form a thin layer of oxide film due to contact with oxygen in the air. After electrolysis or chemical polishing, some passivation treatment is performed to form a passivation film. If there is no passivation treatment, there will be a thin oxide film. It can be said that metals generally form an oxide film in contact with oxygen in the air. It's just that some are obvious and some are not! Oxide scale is a corrosion product formed by the oxidation of steel at high temperature. It consists of ferrous oxide, ferric oxide and ferric oxide. The oxide scale will accelerate the corrosion of the metal, so the larger the area of the oxide scale, the faster the corrosion rate of the steel substrate and the more serious the corrosion.

Removal of this oxide film is a troublesome problem. Traditional cleaning is time-consuming and laborious, and there are certain consumables, so it is not very convenient to clean. The laser derusting cleaning machine can quickly clean the oxide layer and oil stains on the surface of stainless steel. Because it is a non-contact, non-abrasive cleaning method, it will not cause damage to the surface of the workpiece!

The principle of laser cleaning is to use high-frequency high-energy laser pulses to irradiate the surface of the workpiece. The coating can instantly absorb the focused laser energy, so that the oil stains, rust spots or coatings on the surface can be evaporated or peeled off instantly, effectively removing surface attachments or surfaces at high speed. The coating is cleaned in such a way that short duration laser pulses under appropriate parameters do not damage the metal substrate.

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