The principle of bromine staining
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When using a diaphragm pump to pump bromine, in the areas that come into contact with bromine, as well as in those places where bromine penetrates, it turns the PTFE diaphragm and PVDF casing orange! I would like to ask everyone: 1. What is the principle behind this coloring? 2. Is it true that the higher the pressure, the darker the coloring? Does the coloring become less noticeable at pressures below a certain level? In other words, are there areas that are not colored, but bromine may still have penetrated there?
Dyeing is commonly used in the printing and dyeing industry. There are several methods of dyeing, including adsorption, diffusion, and fixation; in our industry, adsorption and penetration are sufficient to understand
It’s not called dyeing; it’s mainly because bromine has a high density and strong penetration power