Why Use Hot-Dip Galvanized Steel Ladders in the Construction Process

1. Hot-dip galvanizing is a chemical process, classified as an electrochemical reaction. Cold-dip galvanizing is a physical process, merely involving a zinc coating on the surface with no galvanizing inside, making the zinc layer prone to peeling off. Hot-dip galvanizing is commonly used in construction projects.

2. Hot-dip galvanized pipes are formed by causing the molten metal to react with the iron substrate, creating an alloy layer that binds the substrate and the coating together. The hot-dip galvanizing process involves first pickling the steel pipes to remove surface oxide iron. After pickling, the pipes are cleaned in a bath of ammonium chloride or zinc chloride solution, or a mixture of both. They are then immersed in a hot-dip galvanizing tank. Hot-dip galvanizing offers advantages such as even coating, strong adhesion of steel platforms, and long service life. For cold galvanizing, or electroplating, there are various techniques. Generally speaking, it involves cleaning, electroplating, and passivation processes. The color passivation, which is the color we see on cold-dipped pipes, involves zincate galvanizing on steel platforms, resulting in a surface that is red or green with a slight yellow hue (Cr+6 for red, Cr+3 for green). Purple should not appear (indicating a porous passivation layer). A simple test is to rub the surface of the part with your fingers a few times; there should be no discoloration. Among scaffold boards, the most fundamental difference is the thickness of the coating, with electroplated zinc layers typically ranging from 20 to 30 μm, spray galvanized layers around 100 μm, and steel platform specifications with immersion galvanized layers generally around 200 μm. However, the thickness of the coating can vary in any given process.