Inactivation treatment (passivation treatment)

basic information

The most important corrosion resistance varies depending on the material and processing history. It is necessary to confirm whether passivation treatment is effective for the usage environment. Passivation treatment can be performed alone, but when addressing issues (such as difficulty in removing discoloration or existing rust) or upgrading (to further enhance corrosion resistance or achieve a desired gloss), it is combined with processes like pickling or electropolishing. We can propose the optimal treatment, so please feel free to consult us. 【Applicable Materials】 - General austenitic stainless steels such as SUS304, SUS316, SUS201, SUS301, etc. - General ferritic stainless steels such as SUS430, SUS405, SUS429, etc. - General martensitic stainless steels such as SUS420, SUS440, etc. * - General duplex stainless steels such as SUS329, etc. - General precipitation hardening stainless steels such as SUS630, etc. * * Sufficient corrosion resistance may not be obtained depending on the heat treatment conditions. ◇◇ Please feel free to contact us for more details ◇◇

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Applications/Examples of results

[Examples of Processed Products] Antenna supports in coastal areas / Food container fittings / Stainless steel piping components / Sanitary piping / Industrial stainless steel chemical tanks / Industrial housings, etc. ◇◇ Please feel free to contact us for more details ◇◇

Detailed information

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  [Surface Treatment Example] Passivation Treatment of Sanitary Piping Both the inner and outer surfaces are finished to a mirror polish, but depending on the application, there are cases where a passivation treatment is performed as a final finish to achieve higher corrosion resistance. [Specifications] Material: SUS316L Size: Approximately 250×80 (maximum width) [Treatment Purpose] Even with SUS316L material, the treatment is performed to ensure corrosion resistance with extra care. [Results] The passivation treatment has the characteristic of "no change in appearance after treatment," allowing for an increase in corrosion resistance without compromising the mirror-finished surface.

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  [Surface Treatment Case] Acid Pickling + Passivation Treatment of Industrial Punching Baskets This is a case of treatment where acid pickling and passivation treatment were applied to punching containers used in industrial equipment. [Specifications] Material: SUS304 Size: Approximately φ550×400H Weight: Approximately 15kg [Treatment Purpose] - If welding scale remains, rust is likely to occur from that area, and there is also dirt from processing. - Removal of welding scale - Removal of dirt and improvement of appearance through acid pickling [Results] By performing acid pickling and passivation treatment, the oxidized scale at the welding points was removed, reducing the risk of corrosion and rust formation. The appearance has also regained a clean metallic look typical of stainless steel. Our company achieves a finish with excellent aesthetics through post-treatment designed to minimize chemical residues and our expertise in acid pickling.

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  [Surface Treatment Case] Passivation Treatment of Antenna Stays Used in Coastal Areas The antenna stay in the photo had the issue of "rust appearing from gaps and welds, not lasting long, and being frequently replaced. There are stains present, which may be a problem." Therefore, our company considered that while the stains are indeed an issue, other corrosion-resistant treatments are necessary for longer durability. We proposed removing the stains through re-pickling and then applying electropolishing followed by passivation treatment. First, we cleaned the stains and scale residues with re-pickling, and then performed electropolishing. Finally, we conducted the passivation treatment. As a result, the finish was free of stains and scale residues, and even when the time would normally come for rust and replacement, it has remained solid without rusting.