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With the wide application of stainless steel pipes, people's requirements are getting higher and higher, and the processing technology has become diversified. Pickling is one of the processing techniques. Do you know why stainless steel pipes appear after pickling Is hydrogen embrittlement reaction?
The reason is that the hydrogen has the effect of stripping the iron oxide scale during the pickling of the stainless steel tube, and it also diffuses into the steel body, and then accumulates at the impurity or gas machine, which will lead to an increase in internal stress. The plasticity of steel decreases and the performance of steel increases. This effect is called hydrogen embrittlement. The hydrogen embrittlement is mainly affected by the diffusion rate of hydrogen atoms.
1.The diffusion speed of hydrogen in sulfuric acid solution is much faster than the diffusion speed of hydrogen in hydrochloric acid solution.
2.If the pickling temperature is increased, the diffusion rate of ammonia will increase sharply, and if the pickling concentration is increased, the diffusion rate of ammonia will not increase much, so try not to pickle at low concentration and high temperature.
3.In the pickling process of stainless steel pipe, if there are inclusions such as hydrogen sulfide, carbon dioxide and arsenic, it will increase the diffusion rate of hydrogen atoms, which will increase the possibility of hydrogen embrittlement.