{"id":1155,"date":"2025-07-30T17:22:59","date_gmt":"2025-07-30T09:22:59","guid":{"rendered":"https:\/\/yofoen.com\/?p=1155"},"modified":"2025-07-30T17:22:59","modified_gmt":"2025-07-30T09:22:59","slug":"cnc-product-post-processing-plating-process","status":"publish","type":"post","link":"https:\/\/yofoen.com\/en\/cnc-product-post-processing-plating-process\/","title":{"rendered":"Electroplating Process for CNC Post-Processing"},"content":{"rendered":"

Electroplating post-treatment for CNC machined products (prototypes) is a critical process to enhance appearance quality and corrosion resistance, typically includingcleaning, electroplating, polishing, and spraying<\/strong>steps. Below is the detailed process flow and key considerations:<\/p>\n

1. Conventional Process for Electroplating Post-Treatment of CNC<\/strong>Machined Products<\/strong><\/h3>\n

(1) Pre-treatment (Cleaning and Surface Preparation)<\/strong><\/h4>\n

Purpose<\/strong>: Remove oil stains and impurities to ensure adhesion of the electroplated layer.<\/p>\n

Steps<\/strong>:<\/p>\n

Ultrasonic cleaning<\/strong>: Use solvents (e.g., alcohol, acetone) or alkaline cleaning agents to remove residual oil stains and cutting fluid from machining.<\/p>\n

Water rinsing<\/strong>: Rinse with clean water to remove residual cleaning agents.<\/p>\n

Acid pickling<\/strong>(optional): Perform acid pickling (e.g., with dilute sulfuric acid or hydrochloric acid) on metal parts (such as copper or aluminum) to remove oxide layers.<\/p>\n

Drying<\/strong>: Use compressed air or drying equipment to blow-dry, avoiding water stains.<\/p>\n

\"Electroplating<\/p>\n

(2) Electroplating<\/strong><\/h4>\n

Purpose<\/strong>: Deposit a layer of metal (e.g., nickel, chromium, gold) on the product surface to enhance gloss and corrosion resistance.<\/p>\n

Steps<\/strong>:<\/p>\n

Racking<\/strong>: Secure the product on a conductive rack to ensure uniform contact with the electrolyte.<\/p>\n

Pre-plating<\/strong>(optional): Pre-plate a layer of nickel or copper on easily oxidizable materials (e.g., copper, zinc alloy) to enhance adhesion.<\/p>\n

Main plating<\/strong>:<\/p>\n

Nickel plating<\/strong>: Improves hardness and corrosion resistance, with a typical thickness of 5-20 \u03bcm.<\/p>\n

Chromium plating<\/strong>: Enhances gloss and wear resistance, with a typical thickness of 0.05-0.2 \u03bcm.<\/p>\n

Gold\/silver plating<\/strong>: Used for parts with high decorative requirements, with a typical thickness of 0.1-1 \u03bcm.<\/p>\n

Post-rinsing<\/strong>: Rinse with clean water to remove residual electrolyte.<\/p>\n

(3) Polishing and Grinding<\/strong><\/h4>\n

Purpose<\/strong>: Repair minor defects on the electroplated surface (e.g., pitting, scratches) to improve gloss.<\/p>\n

Steps<\/strong>:<\/p>\n

Mechanical polishing<\/strong>: Use sandpaper (from coarse to fine, e.g., 600-grit to 2000-grit) or polishing wheels to remove surface irregularities.<\/p>\n

Mirror polishing<\/strong>(optional): For parts requiring high gloss, use polishing paste (e.g., diamond paste) for mirror finishing.<\/p>\n

Cleaning<\/strong>: Clean again after polishing to avoid residual abrasive particles.<\/p>\n

 <\/p>\n

(4) Spraying (Optional)<\/strong><\/h4>\n

Purpose<\/strong>: Add color or a protective layer to cover electroplating defects.<\/p>\n

Steps<\/strong>:<\/p>\n

Primer spraying<\/strong>: Enhance adhesion (e.g., epoxy primer).<\/p>\n

Topcoat spraying<\/strong>: Select desired color (e.g., PVD vacuum coating, UV paint).<\/p>\n

Drying and curing<\/strong>: Cure at high temperature or with UV light, depending on the paint type.<\/p>\n

(5) Quality Inspection and Packaging<\/strong><\/h4>\n

Inspection items<\/strong>:<\/p>\n

: Electroplated layer thickness (measured with a thickness gauge).<\/p>\n

Surface gloss and color consistency.<\/p>\n

Presence of bubbles, scratches, or plating defects.<\/p>\n

Packaging<\/strong>: Wrap with anti-static bags or soft materials to avoid scratches.<\/p>\n

2. <\/strong>Key Considerations<\/strong><\/h3>\n

(1) Material Compatibility<\/strong><\/h4>\n

Metal products<\/strong>(e.g., aluminum alloy, copper): Require passivation or pre-plating treatment to prevent oxidation.<\/p>\n

Plastic products<\/strong>(e.g., ABS, PC): Require conductive paint spraying before electroplating.<\/p>\n

(2) Electroplated Layer Thickness Control<\/strong><\/h4>\n

Too thin: Insufficient corrosion resistance and prone to wear.<\/p>\n

Excessive Thickness: Stress accumulation leads to cracking or peeling.<\/p>\n

Recommendations<\/strong>: Functional plating (e.g., anti-corrosion) thickness \u226510\u03bcm; decorative plating (e.g., bright chrome) thickness \u22640.2\u03bcm.<\/p>\n

(3) Polishing Process Selection<\/strong><\/h4>\n

Manual Polishing<\/strong>: Suitable for small batches and complex curved surfaces, but inefficient.<\/p>\n

Automated Polishing<\/strong>: Suitable for large batches of simple parts, with high consistency.<\/p>\n

(4) Environmental Protection and Safety<\/strong><\/h4>\n

Plating solution contains heavy metals (e.g., chromium, nickel); waste liquid must be treated in compliance with regulations.<\/p>\n

Polishing dust requires dust removal equipment to avoid inhalation.<\/p>\n

3. <\/strong>Common Issues and Solutions<\/strong><\/h3>\n\n\n\n\n\n\n\n\n
Issue<\/strong><\/td>\nCause<\/strong><\/td>\nSolution<\/strong><\/td>\n<\/tr>\n<\/thead>\n
Plating layer blistering or peeling<\/td>\nIncomplete pretreatment, oil stains or oxide layer not removed<\/td>\nStrengthen cleaning and pickling steps to ensure surface cleanliness<\/td>\n<\/tr>\n
Uneven surface gloss<\/td>\nUneven current density or electrolyte temperature fluctuations<\/td>\nAdjust plating parameters and optimize rack design<\/td>\n<\/tr>\n
Scratches after polishing<\/td>\nAbrasive particles too large or improper operation<\/td>\nGradually use finer sandpaper and control polishing pressure<\/td>\n<\/tr>\n
Inconsistent plating color<\/td>\nFluctuations in electrolyte composition or poor conductivity of racks<\/td>\nRegularly test electrolyte and ensure good conductivity of racks<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

4. <\/strong>Summary<\/strong><\/h3>\n

CNCProduct<\/a>The core post-plating treatment process is:Cleaning \u2192 Plating \u2192 Polishing \u2192 Coating<\/strong>, with specific processes adjusted based on material, appearance requirements, and functional needs. Key success factors include:<\/p>\n

Strict pretreatment (ensuring adhesion).<\/p>\n

Precise control of plating parameters (thickness, current, temperature).<\/p>\n

Reasonable polishing process (repairing defects and enhancing gloss).<\/p>\n

Environmentally compliant waste liquid treatment.<\/p>\n

For complex parts or special requirements (e.g., high-temperature resistance, antibacterial properties), other surface treatment technologies (e.g., anodizing, PVD coating) can be combined for further optimization.<\/p>\n

 <\/p>","protected":false},"excerpt":{"rendered":"

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