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What is the functional treatment process for stainless steel coils
source：www.cnlichao.net | Release time：2025年12月23日1、 Core Basic Function Process (Rust Prevention Enhancement, Essential)
This type of process is the core of improving the corrosion resistance of stainless steel coils and is also the most commonly used pretreatment process to ensure the durability of the substrate
1. Passivation treatment
Principle: Soak the stainless steel coil in nitric acid or chromium free passivation solution to form a dense and uniform Cr ₂ O Ⅲ passivation film on the surface, block the small pores on the surface, and isolate the external corrosive medium
Function: Significantly enhance rust prevention ability and prevent rusting during daily use; Chromium free passivation meets environmental requirements and is suitable for the food and pharmaceutical industries
Adaptation scenario: Basic rust prevention requirements for all industries, such as stainless steel coils for kitchenware, home appliances, and hardware accessories
2. Integrated pickling and passivation
Principle: First, acid wash to remove surface oxide scale and rust spots, then directly passivate to complete impurity removal and rust prevention in one step
Function: It not only cleans surface defects, but also strengthens rust prevention, simplifies processes, and improves efficiency
Adaptation scenarios: Hot rolled stainless steel coils (surface prone to oxide scale), pre-treatment of industrial stainless steel coils
2、 Surface beauty and wear-resistant functional craftsmanship (enhancing appearance and durability)
Focusing on optimizing surface texture while enhancing wear resistance and scratch resistance, suitable for decoration and manufacturing scenarios
1. Polishing treatment
Categories: Mechanical polishing (sand belt polishing), chemical polishing, electrolytic polishing
Function: Mechanical polishing improves surface smoothness (drawing, mirror effect); After electrolytic polishing, the surface is more delicate, with stronger corrosion resistance and no burrs
Applicable scenarios: Decorative coils (elevators, curtain walls), stainless steel coils for food grade equipment and medical devices
2. Matte/brushed treatment
Principle: Through unidirectional sanding with a sand belt, a uniform frosted or brushed texture is formed
Function: Matte texture, anti fingerprint, anti scratch, beautiful and low-key; Avoid mirror reflection and glare
Adaptation scenarios: home appliance panels (refrigerators, washing machines), kitchen and bathroom countertops, decorative panels
3. Sandblasting treatment
Principle: High pressure injection of quartz sand and alumina sand forms a uniform rough matte surface on the surface
Function: Wear resistant and scratch resistant, enhance subsequent coating/film adhesion, good texture
Adaptation scenarios: architectural decoration, outdoor curtain walls, stainless steel coils that require spraying
4. Film coating treatment
Principle: Surface bonded with PE protective film, divided into single-sided/double-sided film coating
Function: Anti scratch, anti pollution, protecting surface smoothness, no additional protection required during subsequent processing
Applicable scenarios: Stainless steel coils for all decoration and precision machining, protection during transportation/processing
3、 Special functional processing technology (customized requirements, adapted to exclusive scenarios)
Customize functions to meet the special needs of the industry and solve the pain points that ordinary stainless steel coils cannot meet
1. Coating treatment (functionalization of coating)
Category: Copper plating, nickel plating, zinc plating, titanium plating (PVD vacuum plating)
Function: Copper plating enhances conductivity; Nickel plating enhances wear resistance and rust prevention; Galvanizing further enhances weather resistance; Titanium plating (titanium gold, rose gold) enhances appearance+wear resistance, decorative effect
Adaptation scenario: Copper plating is used for conductive components; Titanium plating is used for decoration (hotels, exhibition halls) and hardware accessories
2. Coating treatment
Categories: Spray fluorocarbon coating, powder coating, antibacterial coating
Function: Fluorocarbon coating has strong weather resistance, UV resistance, corrosion resistance, and is suitable for outdoor use; Powder coating with rich colors, wear-resistant and scratch resistant; Antibacterial coating prevents bacterial growth (such as silver ion coating)
Applicable scenarios: outdoor curtain wall (fluorocarbon coating), household appliance shell (powder coating), food and kitchen utensils (antibacterial coating)
3. Anti fingerprint processing
Principle: Apply anti fingerprint coating on the surface to form a hydrophobic and oleophobic film
Function: Anti fingerprint residue, easy to clean, keeping the surface clean and tidy without affecting the original texture
Adaptation scenarios: Home appliance panels, mobile phone frames, stainless steel coils for kitchen and bathroom products
4. High temperature resistant treatment
Principle: Stabilize the internal structure of stainless steel through solution treatment, or apply a high-temperature resistant coating on the surface
Function: Resistant to high temperatures (300 ℃ -800 ℃), does not deform, oxidize, or lose strength at high temperatures
Adaptation scenario: Stainless steel coils for industrial furnaces, boilers, and high-temperature equipment accessories
5. Anti static treatment
Principle: Apply anti-static coating on the surface or mix conductive fillers to reduce surface resistance
Function: Eliminate static electricity, prevent static electricity from adsorbing dust and causing discharge
Adaptation scenarios: Stainless steel coils for the electronics industry (chip and circuit board production) and cleanroom use
6. Corrosion resistant strengthening treatment (special for extreme environments)
Category: Chromium infiltration, Nitrogen infiltration, Thickening of passivation film
Function: Form a thicker and denser protective layer on the surface, resistant to extreme corrosive environments such as acid and alkali, salt spray, etc
Adaptation scenarios: Chemical industry (contact with acidic and alkaline media), marine environment (high salt spray), coastal outdoor stainless steel coils
4、 The core advantages of functional technology and the key to selection
1. Core advantages
Strong targeting: select processes according to needs and correctly match industry demands;
Not damaging the substrate: Most processes involve surface treatment, which does not affect the strength and toughness of the stainless steel coil itself;
Suitable for mass production: capable of continuous online processing, suitable for large-scale industrial production of stainless steel coils.
2. Selection key
First, look at the usage environment: choose weather resistant/fluorocarbon coating for outdoor use, corrosion-resistant reinforcement for chemical use, and anti-static for electronic use;
Looking at usage requirements again: choose polishing/titanium plating for decoration, film coating/anti fingerprint for precision machining, copper plating for conductivity;
Environmental requirements: Choose chromium free passivation and food grade coatings for food/medicine to avoid heavy metal residues.
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