Excellent Passivation Treatment (EP Treatment) that dramatically improves the corrosion resistance of SUS410!
To cover the corrosion resistance of SUS410, passivation treatment is essential; however, our company has developed and implemented a "Super Passivation Treatment (SP Treatment)" that significantly enhances corrosion resistance (target: head rusting 500 hours). We have now developed an "Excellent Passivation Treatment (EP Treatment)" that dramatically improves corrosion resistance even further (target: head rusting 1000 hours).
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basic information
Passivation is a type of rust prevention treatment for stainless steel, known in Japanese as "passivation treatment." Stainless steel is known for its resistance to rust, which is due to the natural formation of an oxide film on its surface that prevents further contact with oxygen (oxidation). This is the reason why stainless steel is less prone to rust. This oxide film is different from the iron oxide found on regular iron; it is chromium oxide formed by the combination of chromium and oxygen within the stainless steel, and this chromium oxide serves as a protective film. Although this chromium oxide film forms naturally, it is very thin (around 20Å) and can easily be damaged by external factors, leading to rust formation in those areas. When this film is forcibly generated using nitric acid-based oxidizers, a denser and more robust film is created. This process of forcibly generating the film is known as passivation treatment.
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Detailed information
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Features The surface of stainless steel is modified through a pretreatment to generate a passive film, and further protected by a special post-treatment, safeguarding the stainless steel substrate.
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EP processing process For details, please refer to the table on our website. https://www.maruemu.co.jp/product/ep.html
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Company information
In 1927, our company started as a manufacturing and sales business focused on hardware products such as cotter pins, and in 1957, we began mass production as a pioneer of stainless steel screws. The frontier spirit that lives on at Maruemu Seisakusho has led to the creation of core technologies based on the accumulation of history and skills, including "product development of new materials, material processing, and fastening technology."