Forms a uniform oxide film on stainless steel, significantly reducing corrosion risk. This is a high corrosion-resistant, low-cost surface treatment technology that can accommodate complex shapes and mass-produced items.
The passivation treatment by Toyo Chemical involves chemically re-forming a stable oxide film (passivation film) on the surface of stainless steel, significantly enhancing the metal's corrosion resistance as a post-processing technology. It reconstructs the protective film that may have been temporarily lost during processing, welding, or heat treatment, preventing rust formation and improving the reliability and durability of the product. This treatment is applicable not only to austenitic stainless steels but also to ferritic and martensitic stainless steels, with proven results in various materials including SUS304 and SUS316. It is often introduced as a subsequent process after pickling or degreasing, and when combined with electropolishing or buff polishing, it can yield further benefits in both appearance quality and functionality. Since the passivation treatment is a non-contact process using chemical solutions, it allows for uniform treatment of internal surfaces and complex shapes without the risk of deformation. It is also capable of handling large-scale processing, enabling stable supply at low costs. Main applications include medical devices, food manufacturing equipment, semiconductor-related components, sanitary piping, and valve parts. This treatment technology, which supports the production of rust- and corrosion-resistant products, has received high praise in environments where long-term quality maintenance is required.
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basic information
Supported materials: SUS304, SUS316, SUS430 (ferritic), SUS410 (martensitic), etc. Supported shapes: complex shapes, welded structures, piping, enclosures, sheet metal parts, small precision parts, etc. Processing method: regeneration of passive film through chemical treatment (non-contact type, liquid immersion) Purpose of treatment: improvement of corrosion resistance, protection after pickling, rust prevention, film regeneration, finishing assistance after processing Dimensional change: almost none (high dimensional stability due to non-contact treatment) Surface finish: minimal appearance change, may become slightly matte (varies depending on material and pre-treatment) Examples of combined processes: after pickling treatment, after electrolytic polishing, after degreasing, after buff polishing, etc. Supported sizes: up to approximately 1000mm in length, up to about 20kg in weight (negotiable) Supported lot sizes: capable of handling from one prototype to mass production, regardless of size Quality control and inspection: appearance inspection, dimensional verification, treatment history management, identification marking, etc. Options: vacuum packaging, attachment of inspection certificates, lot traceability, application of identification labels, etc. Remarks: proposals for pre-treatment and composite processing tailored to special specifications and applications are also possible.
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Applications/Examples of results
【Target Industries】 Medical devices / Food manufacturing / Semiconductor manufacturing equipment / Precision machinery / Scientific instruments / Environmental equipment, etc. 【Target Parts and Product Names】 Piping components, valve parts, welded frames, tanks, fittings, covers for analytical instruments, etc. 【Processing Objectives】 Improvement of corrosion resistance, formation of protective films after acid cleaning, rust prevention, measures against welding burn, film regeneration, etc. 【Material Types】 SUS304 / SUS316 / SUS430 / SUS410 / Duplex stainless steel, etc. 【Usage Environment and Conditions】 Use in clean rooms / Outdoor installation / Exposure to moisture and chemicals / Components for sterilization in medical devices 【Track Record and Adoption Examples】 Structural components for medical device OEMs / Regular lots for food machinery manufacturers / Mass production achievements for semiconductor equipment parts, etc. 【Lot Scale and Frequency】 Capable of handling from single prototypes to mass production, regardless of size 【Notes and Requests】 Request for inspection certificate attachment / Vacuum packaging for shipment / Specification for combination with other treatments, etc.
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Company information
Toyohashi Chemical Co., Ltd. is a comprehensive technology company that consistently responds to a wide range of needs, from contract processing to the manufacturing of surface treatment agents and processing equipment, the development of automatic inspection devices, and even technical consulting, as a leading company in metal surface treatment. We have established a consistent production system utilizing precise electro-polishing and cleaning technologies, vacuum packaging and assembly in clean rooms, and advanced processing techniques. We have gained high trust in fields where quality is essential, such as semiconductors, medical devices, and food-related equipment. As a partner that responds to all surface treatment challenges with technology and flexible adaptability, we continue to support our customers' manufacturing endeavors.
