Surface Treatment Services for Sheet Metal: Quality from China Suppliers and Factory
Service Scope
Analyze the best solution through 6 dimensions such as salt spray level and conductive requirement.
Predict 12 common defects such as color difference of aluminum alloy anodizing.
Recommended cost-effective combinations such as "galvanized base + powder coating".
Service Mode
Let professional choice achieve product value
Consult NowGeneral 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 do I choose the best surface treatment for outdoor steel structures?
For long-term outdoor rust resistance, hot-dip galvanizing provides excellent anti-rust performance (600-1500h salt spray resistance). A cost-effective optimization is a "galvanized base + powder coating" combination, which provides both strong corrosion protection and customizable aesthetics.
Q2 What are the primary advantages of electrolytic polishing for stainless steel?
Electrolytic polishing yields an ultra-clean surface with a roughness Ra ≤ 0.1μm and antibacterial properties by electrochemically dissolving microscopic bumps and thickening the natural chromium passivation layer. It is widely used in pharmaceutical and semiconductor industries.
Q3 How can common defects like color differences in aluminum anodizing be avoided?
Mingli engineers analyze 12 common process traps, ensuring stable electrolyte temperature, precise current density control, uniform material alloy composition, and proper sealing processes to prevent color variation across batches.
Q4 Which surface treatment is recommended for high conductivity and weldability?
For copper and electrical components, electroplating with tin (3-10μm) or silver (2-6μm) is recommended to maximize conductivity and solderability. For aluminum parts, chemical nickel-plating enhances surface hardness (HV500) while ensuring reliable weldability.
Q5 How does Mingli Metal help reduce overall surface finishing costs?
Through technical diagnosis across 6 core dimensions (including salt spray standards and mechanical requirements), our engineering team identifies alternative processes and composite coatings that can reduce manufacturing costs by up to 40% per square meter without compromising performance.