Prevent stainless steel vacuum valve rust introduction

Stainless steel vacuum valves have excellent performance. Especially in terms of rust prevention, it has better conditions than many similar products. However, it still encounters various rust conditions during the production process, so we will help you solve this problem.

    In all enterprises, the stainless steel valve series has been paid more and more attention. It was thought that stainless steel is a kind of material that will not rust. Unexpectedly, the stainless steel vacuum valve will also rust during use. In order to determine the truth about the rust of a stainless steel vacuum valve, we can use a test method to determine if the valve meets the standard.

    We pass chemical analysis, metallographic examination, heat treatment and SEM analysis. Focus on the analysis of the microstructure, first from the stainless steel valve body rust cut a small part, then grinding and polishing, corrosion with aqueous solution of ferric chloride, at the end of the microscope, according to the normal, after the heat treatment of stainless steel, will get Austenitic organization. There are two kinds of judgments, one is σ phase, the other is carbide, and their common feature is that they can cause the sensitivity of stainless steel to intergranular corrosion.

    According to different scientific experiments, different test methods can be used to obtain different structural methods. The biggest reason is that the valve body itself is made of stainless steel. Therefore, when selecting a stainless steel vacuum valve, it is necessary to strictly select the material of the valve according to the installation conditions to avoid the problem of the material which is formed by the precipitation of carbides along the grain boundary to form a chromium-depleted region and rust the valve.

    Therefore, in order to prevent stainless steel vacuum valves that can rust, we should also know how to handle vacuum valves that have been rusted in this case to ensure normal production needs.

    After our stainless steel vacuum valve is finished, how many steps need to be completed?

Parts of stainless steel vacuum valves must be treated as follows before assembly:

    1) According to the processing requirements, some parts need to be polished, and the surface cannot be processed with burrs;

    2) All parts are degreased;

    3) pickling passivation after degreasing is completed (cleaning product does not contain phosphorus);

    4) Rinse with pure water, no residual drug.

    5) Wipe one by one with non-woven fabric or precision filter paper and analyze the pure alcohol until there is no dirty color.