How many ways are there to electro-galvanize and what is the process flow?

Commonly used surface treatment process flow

(1) Electro-galvanizing process flow for steel parts

┌Acid galvanizing

Oil removal → Rust removal → │

→ Purification → Drying

└Alkaline galvanizing

(2) Normal temperature blackening process flow for steel parts

┌Dipping in dehydrated anti-rust oil

│

│

Drying

Degreasing → Descaling → Normal temperature blackening → │ Dip in soap solution --→ Dip in ingot oil or machine oil

│

│

└Dip in sealing agent

(3) Phosphatizing process of iron and steel parts

Degreasing → Descaling → surface conditioning → phosphating → painting

(4) ABS/PC plastic plating process

oil removal → hydrophilic → pre-coarse (PC ≥ 50%) → roughing → neutralization → rectification → revitalization → decoating → chemical precipitation of nickel → pyrolysis of copper → acid copper plating → plating of semi-bright nickel → plating of nickel → bright nickel → sealing → chrome plating

(5) PCB plating process

Degreasing → roughing → pre-impregnation → activation → debinding → chemical copper deposition → copper plating → acid degreasing → micro-etching → low-stress nickel plating → bright nickel plating → gold plating → drying

(6) Multi-layer plating process of steel parts

Degreasing → descaling → cyanide copper plating → acid copper plating → semi-bright nickel plating → high-sulfur nickel plating → bright nickel plating → nickel plating sealing → chrome plating

(7) Pre-treatment of steel parts (polished parts, Non-polished parts) process flow

1, polished parts → dewaxing → hot dip degreasing → de-oiling → acid etching → non-it plating

2, non-polished parts → hot dip de-oiling → de-oiling → acid etching → other plating

(8) zinc alloy parts plating pre-treatment process flow

Dewaxing → hot dip de-oiling → de-oiling → acid etching → alkaline copper plating → acid copper or copper pyrophosphate plating → other plating

(9) Aluminum and its alloys plating pretreatment process

Dewaxing → hot dip degreasing → degreasing → acid etching and descaling → chemical zinc deposition → acid immersion → secondary immersion → alkaline copper or nickel plating → other plating

Dewaxing → hot dip degreasing → degreasing → acid etching and descaling → aluminum chromatization → drying → foam spraying or powder spraying → drying or roughening → finished products

Dewaxing → hot dip degreasing → degreasing → acid etching and descaling → anodizing → dyeing → sealing → drying → products

(10) Iron parts chrome plating process:

Dewaxing → hot dip degreasing → cathode → anode → degreasing → weak acid etching → pre-plating of alkaline copper → acidic bright copper (selective) → bright nickel → chrome plating or other

Dewaxing → hot dip degreasing → cathode → anode → weak acid etching Degreasing → hot dip degreasing → cathode → anode → weak acid etching → semi-bright nickel → high sulfur nickel → bright nickel → nickel seal (selective) → chrome plating

(11) Zinc alloy chrome plating process flow

Dewaxing → hot dip degreasing → cathodic degreasing → acid immersion → alkaline copper → copper pyrophosphate (selective) → acidic bright copper (selective) → bright nickel → chromium plating

(12) Electrically latticed rack and dyeing Process flow

Pre-treatment or plating → pure water washing (2-3 times) → pre-dipping → electro-lattice frame → recycling → pure water washing (2-3 times) → drying → product

This article is from: 博研联盟论坛 ◆ Academic exchanges ◆ Scientific research mutual assistance ◆ Resources **** to enjoy