Surface Pickled & Passivated
Pickled and Passivated Stainless Steel
Pickling removes heat tint and scale after hot work or welding; passivation removes free iron and supports formation of the chromium-rich passive surface.
Appearance
- Clean matte-to-satin surface whose tone follows the base product, fabrication and chemical treatment route.
Production route
- Degreasing and preparation
- Controlled pickling where scale or heat tint must be removed
- Thorough rinsing
- Passivation, final rinse and drying when specified
Typical uses
- Welded tanks and piping
- Chemical equipment
- Food and pharmaceutical fabrications
- Marine and water-treatment assemblies
Purchase-order checks
- Base grade and fabrication condition
- Pickling versus passivation scope
- Internal and external access
- Acceptance test or record
- Packing after treatment
Protection and acceptance
- Name the governing cleaning and passivation procedure
- Agree treatment of welds, internal surfaces and inaccessible zones
- Specify final cleanliness, rinse-water and verification records where required
Common defects to control
- Residual heat tint
- Acid staining or over-pickling
- Incomplete rinsing and trapped chemistry
Example purchase description
- 316L welded pipe spool, internal and external weld heat tint removed, pickled and passivated to the project procedure, rinsed, dried and supplied with treatment record.
Technical content updated: 2026-07-29
Organizational author: Tsingshan (Shandong) Iron & Steel Co., Ltd..Review method, status and limitations.
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