Pickling passivation of stainless steel parts
In the process of stainless steel passivation process monitoring nitrate (HNO3(C) and citric acid6H.8O7The concentration of the)
Passivation is a kind of metal polishing process, can be improved by removing pollutants in metal corrosion resistance.
Passivation process includes several steps, in different steps, use different liquid of metal parts for processing.
After the clean, need to deal with the passivation of stainless steel parts acid bath.In this step, the metal parts must be completely in nitric acid or citric acid in the solution.
In order to realize effective passivation, the passivation bath composition and concentration monitoring is very important.In the process of processing of metal parts, the acid concentration in bath can reduce gradually, so need to take a bath liquid.If the pollution of acid bath, also can change the acid concentration and cause corrosion "fast", so as to cause serious adverse etching in the metal surface.
Passivation is completed, you need to use such as sodium hydroxide lye to washing and neutralization of parts, or post-processing in sodium dichromate.
Visa K - PATENTS®Online refractometer as a safe, reliable and fast monitoring tools, can be used to monitor whether conform to the requirements of the concentration of all the passivation process.This online refractometer specially designed for measuring chemical corrosive solution, acid solution can be tolerance, and keep long-term stable performance.
See the application instructions, understand stainless steel pickling passivation for detailed information.
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