010203
Comprehensive Surface Treatment Services by Leading China Suppliers and Factory for Sheet Metal Processing
Service scope
Mingli Metal has a deep understanding of the synergy between materials and processes:
Our technical team, with over 300 industry case experience, can help you:
- Precise diagnosis requirements —— Analyze the best solution through 6 dimensions such as salt spray level and conductive requirement
- Avoiding process traps —— Predict 12 common defects such as color difference of aluminum alloy anodizing
- Cost optimization combination —— Recommended cost-effective combinations such as "galvanized base + powder coating"
Service mode
Let professional choice achieve product value
Mingli engineers will explain to you:
- ✓ Corrosion resistance process matrix under different environments
- ✓ Certification programs for medical, food and other industries
- ✓ 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 | |
| Aluminum material | 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
What is the difference between Hot-Dip Galvanizing and Electrogalvanizing for iron plates?
Hot-dip galvanizing involves coating the metal in a 450℃ zinc bath, resulting in a thick layer (≥80μm) ideal for long-term outdoor rust prevention (600-1500h salt spray resistance). Electrogalvanizing uses electrochemical deposition for a much thinner layer (5-20μm), which retains basic conductivity and is suitable for internal electrical connectors or standard parts.
Why is electrolytic polishing preferred for food and medical stainless steel equipment?
Electrolytic polishing electrochemically dissolves microscopic bumps on the metal surface, resulting in an ultra-clean, smooth finish (Ra ≤ 0.1μm) and a thickened passivation layer. This makes the surface highly resistant to bacterial buildup and corrosion, which is vital for pharmaceutical pipelines and medical instruments.
How does anodic oxidation improve aluminum components?
Anodic oxidation forms an Al₂O₃ (aluminum oxide) film layer (5-25μm thick) through an electrolyte process. This layer provides excellent wear resistance, electrical insulation, and allows for vibrant multi-color coloring, commonly used in consumer electronics and outdoor signs.
Can you help us optimize surface treatment costs?
Yes. Our engineering team specializes in recommending cost-effective process combinations, such as pairing a galvanized base with a powder coating, which can save up to 40% per square meter while maintaining high performance.
When should chemical nickel-plating be chosen for aluminum?
Chemical nickel-plating should be chosen when your aluminum components require high surface hardness (up to HV500) and reliable weldability. It uses a self-catalyzed nickel-phosphorus alloy coating (10-30μm thick) ideal for precision moving parts and connectors.