The severe reaction of seamless steel pipe is mainly caused by the strong reaction of iron and zinc, so that the complete coating originally composed of alloy layer and pure zinc layer becomes the phenomenon of only alloy layer without pure zinc layer. Gray or dark gray is the color of iron-zinc alloys. Furthermore, if the quality of the zinc solution becomes poor, the iron content in the zinc solution will increase. And due to the iron content, the pure zinc layer on the surface after galvanizing will appear gray, causing color difference, the specific reason: d The material of the electroplated parts contains more carbon, silicon, sulfur and phosphorus elements. The electrochemical reaction between iron and zinc is attributed to the inert electricity formed by these elements, and the relative potential becomes high, which leads to the intensification of the iron and zinc reaction. The content of metallic elements such as aluminum in the zinc bath is relatively small. For the galvanizing of active steel and other materials, the iron-zinc reaction cannot be effectively inhibited, and the iron content in the zinc solution increases, which reduces the quality of the zinc solution. Improvement measures: select the appropriate galvanizing temperature according to the material, and adjust the zinc solution. composition to control the content of aluminum and nickel within a suitable range.
Minimize dipping time as much as possible; cool in water as soon as possible after removing from pot. Purify the zinc liquid in time to ensure the quality of the zinc liquid, let us know your requirements for hot-dip galvanized seamless steel pipe. The rest will be done by us and you will be satisfied.
