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How can the surface quality of 2205 duplex stainless steel seamless pipes be guaranteed after degrea
How can the surface quality of 2205 duplex stainless steel seamless pipes be guaranteed after degreasing treatment?
2205 Duplex Stainless Steel Seamless Pipe Degreasing Post-Processing Surface Quality Assurance Measures
I. Cleaning and Drying Control
Precise Cleaning: Remove residual degreasers using deionized water or distilled water, combined with ultrasonic enhanced cleaning to avoid salt or chemical crystallization.
Drying Process: Use dust-free hot air blow drying (temperature ≤ 80℃) or vacuum drying to prevent oxidation or microbial adhesion.
II. Environmental and Operating Specifications
Clean Environment: Work in a Class 10000 or higher cleanroom, personnel wear anti-static dust-free suits, and tools are disinfected with ethanol.
Anti-abrasion Measures: Use nylon or wooden tools during operation to avoid metal contact and scratching the surface passivation film.
III. Storage and Transportation Protection
Packaging Materials: Wrap with PE film or dust-free paper, avoid contact with sulfur and chlorine materials, and use anti-static foam as padding inside.
Storage Conditions: Store in a warehouse with humidity <40% RH, temperature 15-25℃, away from acid mist and oil sources, and the shelves need to be passivated.
Transport Requirements: Transport in a closed container, disinfect the vehicle before loading, and avoid jolting and collision.
IV. Process Connection and Testing
Timely Passivation: Complete passivation within 24 hours after degreasing (e.g., nitric acid + hydrofluoric acid solution), enhancing corrosion resistance.
Surface Testing:
Visual Inspection: No oil stains, watermarks, or scratches;
White Cotton Cloth Wiping Test: No pigment residue;
Contact Angle Test: Water film continuous (contact angle <10°);
Roughness Detection: Ra ≤ 0.8μm (for medical grade, ≤ 0.4μm).
V. Special Requirements (Characteristics of Duplex Steel)
Avoid Strong Acid and Alkali Residues: 2205 is sensitive to chloride ions, the chlorine ion content in the cleaning water should be <25ppm to prevent pitting corrosion.
Temperature Control: The drying and subsequent processing temperatures should not exceed 120℃ to avoid σ phase precipitation affecting corrosion resistance.
Through the "cleaning - environment - storage - testing" full-process control, it is ensured that the surface after degreasing is free of residues and damages, and the unique corrosion resistance and mechanical properties of duplex steel are maintained.
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