China Surface Treatment Services: Quality Metal Finishing Solutions from Trusted Suppliers & Factory
Service scope
Our technical team, with over 300 industry case experience, can help you:
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Precise diagnosis requirements —— Analyze the best solution through 6 dimensions such as salt spray level and conductive requirement
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Avoiding process traps —— Predict 12 common defects such as color difference of aluminum alloy anodizing
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Cost optimization combination —— Recommended cost-effective combinations such as "galvanized base + powder coating"
Service mode
Let professional choice achieve product value
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Corrosion resistance process matrix under different environments
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Certification programs for medical, food and other industries
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Alternative technologies that can save up to 40% per square meter
General Solutions
Function comparison table of surface treatment
| Material category | Surface treatment | Core functional purpose | Process characteristics | Typical application scenarios |
|---|---|---|---|---|
| Iron plate | Spray-paint | Anti-corrosion + colorful decoration | Electrostatic powder coating, film thickness 60-120μm | Cabinet housing/outdoor facilities |
| Hot-galvanize | Long-term anti-rust (salt spray 600-1500h) | 450℃ zinc bath coating, thickness ≥80μm | Building steel structure/power transmission tower | |
| Electrogalvanizing | Basic rust prevention + electrical conductivity retention | Electrochemical deposition, thickness 5-20μm | Electrical connectors/standard parts | |
| Cataphoresis | Complete anti-corrosion for complex parts | Electrodeposition of epoxy resin, film thickness 15-30μm | Automobile chassis/tubular structure | |
| Turn black | Short term rust prevention + reduce reflection | The alkaline oxidation generates Fe₃O₄ film with a thickness of 0.5-1.5μm | Instrument internal parts/tools | |
| Quench | Surface hardened (HRC 50-65) | High frequency/laser heat treatment, depth 0.2-3mm | Gear/mold working surface | |
| Stainless steel | Deactivation | Improved corrosion resistance (salt spray doubled) | Nitrogen removes iron ions and forms chromium passivation film | Food machinery/medical equipment |
| Wire drawing | Decorative texture + cover scratches | Mechanical polishing forms straight or random lines, Ra0.4-1.6μm | Elevator panel/home appliance appearance parts | |
| Electrolytic polishing | Ultra-clean surface (Ra ≤ 0.1μm) + antibacterial | Electrochemical dissolution of bumps and thickening of passivation layer | Pharmaceutical pipeline/semiconductor equipment | |
| Electroplating (gold/copper) | Special functions (conductive/decorative) | Precious metal deposition, thickness 0.1-5μm | Electronic contacts/artistic components | |
| Baking varnish | Special color requirements | After spraying, 180℃ curing is performed to improve the bonding force | Brand logo/Customized equipment panel | |
| Aluminum material | Anodic oxidation | Wear-resistant + insulation + multi-color coloring | The electrolyte forms an Al₂O₃ film with a thickness of 5-25μm | Electronic product case / outdoor signage |
| Wire drawing | Improved metal finish | In the same stainless steel process, pressure should be controlled to prevent deformation | Furniture panel/consumer electronics | |
| Spray-paint | Low cost corrosion protection | Chromium pretreatment is needed to enhance adhesion | General structural parts/internal components | |
| Chemical nickel-plating | Improved hardness (HV500) + weldability | Self-catalyzed nickel-phosphorus alloy coating, 10-30μm thick | Precision moving parts/connectors | |
| Copper material | Deactivation | Anti-oxidation and discoloration | Benzotriazole film formation | Electrical components/artwork |
| Electroplating (tin/silver) | Enhance weldability or conductivity | The tin layer is 3-10μm thick and the silver layer is 2-6μm thick | PCB terminals/high frequency conductors | |
| Chemical stain | Decorative antique bronze/green rust effect | Sulfide or basic copper carbonate reaction | Building decorations/artifacts |
Frequently Asked Questions
Q1: How does Mingli Metal optimize surface treatment costs?
We analyze your requirements across 6 key dimensions (e.g., salt spray level and electrical conductivity) to recommend cost-effective combinations, such as using a "galvanized base + powder coating" instead of more expensive single-process alternatives, saving up to 40% per square meter.
Q2: What is the difference between Hot-Dip Galvanizing and Electrogalvanizing?
Hot-Dip Galvanizing creates a thick zinc coating (≥80μm) in a 450℃ bath, offering long-term outdoor rust prevention (600-1500h salt spray). Electrogalvanizing is an electrochemical process resulting in a thinner layer (5-20μm) ideal for basic indoor rust prevention and maintaining electrical conductivity.
Q3: Why is passivation recommended for stainless steel?
Passivation removes free iron from the surface of stainless steel using nitrogen/acid treatments, forming a protective chromium oxide layer. This chemical process doubles the material's salt spray corrosion resistance, which is essential for medical and food-grade machinery.
Q4: How do you prevent anodizing defects in aluminum alloys?
Our technical team draws on over 300 industry case experiences to predict and prevent up to 12 common anodizing defects, such as color variation, by strictly controlling electrolyte concentrations, temperature, and material pre-treatment parameters.
Q5: Which surface treatment provides the best wear resistance for precision moving parts?
For steel parts, surface hardening (quenching) achieves high hardness (HRC 50-65). For aluminum parts, chemical nickel-plating (electroless nickel) provides a hard (HV500) and highly uniform phosphorus alloy coating, which is ideal for sliding and precision components.