The key factors affecting the coating of black steel seamless pipe
1) The passive film of black steel seamless pipe is a thermodynamically suppressed metastable structure, and its maintenance effect is related to the medium in the environment. Once in the geographical environment, it will cause chemical changes, so before coating, it is necessary to remove the harmful substances attached to the surface of the black steel seamless pipe;
2) Potassium thiocyanate chemical substances will seriously affect the coating of black steel seamless pipes. Therefore, the composition of potassium thiocyanate should be strictly controlled during the whole process of passivation treatment. Once it exceeds the standard, black steel seamless pipes will be destroyed. Steel tube construction. Under normal circumstances, the pharmaceutical factory will limit the amount of potassium thiocyanate, and carry out the next practical operation according to the relative preparation to ensure the coating of the black steel seamless pipe;
3) The moisture content in the black steel seamless pipe is relatively low, and the passivation characteristics are relatively low, which will cause a certain level of influence in the entire coating process. In order to better achieve the actual effect of stronger coating, it is necessary to improve its essential influencing factors;
4) As we all know, the surface of black steel seamless pipe is relatively smooth, because the smoother the surface, the less likely it will be stained. In the production process, the black steel seamless pipe will be polished and coated; in the actual production process, the corrosion resistance of the black steel seamless pipe should be improved.