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Zinc Electroplating


Zinc electroplating uses electrolysis: the fastener (cathode) is placed in a zinc-ion solution, and an electric current reduces zinc ions to deposit a uniform pure zinc layer on the fastener surface. 

Zinc electroplating uses electrolysis: the fastener (cathode) is placed in a zinc-ion solution, and an electric current reduces zinc ions to deposit a uniform pure zinc layer on the fastener surface. 


Previous:  Black Oxide

Process Principle
Zinc electroplating uses electrolysis: the fastener (cathode) is placed in a zinc-ion solution, and an electric current reduces zinc ions to deposit a uniform pure zinc layer on the fastener surface. Zinc acts as a sacrificial anode, corroding preferentially to protect the steel substrate.

 

Key Characteristics

Most widely used – best cost/performance ratio.

Variety of appearances – passivation can produce blue-white, yellow, black, etc.

Moderate corrosion resistance – typical coating thickness 4–12 μm; NSS duration approx. 24–72 hours.

Hydrogen embrittlement risk – acid pickling and electrochemistry can cause hydrogen absorption, especially in high-strength fasteners. Grade 8.8 and above must undergo proper de-embrittlement baking.

 

Applications
Suitable for most indoor and general outdoor environments, e.g., furniture assembly, general machinery, appliance housings, internal electronic structures. Plain zinc electroplating performs poorly in severe environments like marine; zinc-nickel alloy plating is a better alternative.

Process Principle
Zinc electroplating uses electrolysis: the fastener (cathode) is placed in a zinc-ion solution, and an electric current reduces zinc ions to deposit a uniform pure zinc layer on the fastener surface. Zinc acts as a sacrificial anode, corroding preferentially to protect the steel substrate.

 

Key Characteristics

Most widely used – best cost/performance ratio.

Variety of appearances – passivation can produce blue-white, yellow, black, etc.

Moderate corrosion resistance – typical coating thickness 4–12 μm; NSS duration approx. 24–72 hours.

Hydrogen embrittlement risk – acid pickling and electrochemistry can cause hydrogen absorption, especially in high-strength fasteners. Grade 8.8 and above must undergo proper de-embrittlement baking.

 

Applications
Suitable for most indoor and general outdoor environments, e.g., furniture assembly, general machinery, appliance housings, internal electronic structures. Plain zinc electroplating performs poorly in severe environments like marine; zinc-nickel alloy plating is a better alternative.


Previous:  Black Oxide
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