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How are steel pipes galvanized?

Table of Contents

1、 Overview of galvanizing methods for steel pipes
Galvanizing of steel pipes is a common anti-corrosion treatment process, which mainly involves coating the surface of steel pipes with a zinc layer to protect them from oxidation and corrosion. At present, there are two common methods for galvanizing steel pipes: electroplating and hot-dip galvanizing. Below, we will provide a detailed introduction to these two methods.
2、 The difference between electrogalvanizing and hot-dip galvanizing

  1. Electrogalvanizing
    Electrogalvanizing is the process of immersing steel pipes in an electrolyte containing zinc ions, reducing the zinc ions to metallic zinc through the action of current, and attaching them to the surface of the steel pipes, forming a thin layer of zinc. This method is also known as cold galvanizing. Compared to hot-dip galvanizing, the film thickness of electrogalvanizing is relatively thin, usually only a few micrometers, making it suitable for galvanizing small steel pipes.
  2. Hot dip galvanizing
    Hot dip galvanizing is the process of immersing steel pipes in molten zinc solution, and through chemical reactions, forming a dense and uniform layer of zinc on the surface of the steel pipes. This method is also known as hot-dip galvanizing. Compared to electroplating, hot-dip galvanizing has a thicker film thickness, which can reach tens to hundreds of micrometers, making it suitable for galvanizing large steel pipes.
  3. Surface treatment of steel pipes
    Before galvanizing the steel pipe, surface treatment should be carried out to clean and dry the surface of the steel pipe, remove oil stains, rust, and impurities, etc.
  4. Preparation of galvanized electrolyte
    When conducting electroplating, it is necessary to prepare an electrolyte containing zinc ions. The composition, concentration, and temperature of the electrolyte need to be prepared in a certain proportion to ensure the quality and thickness of the coating.
  5. Process flow of hot-dip galvanizing
    Hot dip galvanizing generally requires several process steps, including degreasing, acid washing, water washing, drying, melt immersion, cooling, and extraction. These processes require strict control of parameters to ensure the quality and film thickness of the zinc layer.

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