What is the process of galvanizing and what are the factors that affect the effect of cold galvanizing

what is the process flow of galvanizing?

Electrogalvanizing, also known as cold galvanizing in the industry, is the process of forming uniform, dense and well-combined metal or alloy deposition layer on the surface of the parts by electrolysis. Compared with other metals, zinc is a relatively cheap and easy plating of a metal, a low value corrosion prevention electroplating, is widely used to protect iron and steel parts, especially to prevent atmospheric corrosion, and used for decoration. Plating techniques include groove plating (or hanging plating), roll plating (suitable for small parts), blue plating, automatic plating and continuous plating (suitable for wire and strip).

Take galvanized iron alloy as an example, the process flow of galvanized iron is chemical degreasing → hot water washing → electric degreasing → hot water washing → water washing → strong corrosion → water washing → water washing → electrogalvanized iron alloy → water washing → light passivation → water washing → dry.

What are the factors that affect the effect of cold galvanizing?

1. The influence of zinc content

Zinc content is too high, bright range is narrow, easy to obtain thick coating, coating iron content is reduced. The zinc content is too low, the brightness range is wide, it takes a long time to reach the required thickness, and the plating has high iron content.

2. The influence of sodium hydroxide content

When sodium hydroxide content is too high, high temperature operation is easy to burn; When sodium hydroxide content is too low, the dispersion ability is poor.

3. The influence of iron content

The iron content is too high, the iron content in the coating is high, the passivation film is not bright; The iron content is too low, the iron content in the coating is low, the corrosion resistance is reduced, and the color is olive.

4. The influence of brightener

If ZF-IOOA is too high, the coating is brittle. Too low, low current area without coating, passivation color is uneven; If ZF-100b is too high, the coating is brittle. Too low and the entire coating will not shine.

5. The influence of temperature

The temperature is too high, the dispersion ability is reduced, the iron content in the coating is high, the corrosion resistance is reduced, the color of the passivation film is not uniform, and the hair is flower; The temperature is too low, the high current density area is scorched, the coating is brittle and the deposition speed is slow.

6. Influence of cathode movement

Cathode movement must be used. Moving too fast, high current density area coating rough; Too slow, may produce airflow, local no coating.