40cr alloy pipe material anti-corrosion measures 40cr alloy pipe corrosion behavior can be prevented and controlled, as long as the raw material purchase, alloy composition is effectively controlled, to ensure that the magnesium, silicon ratio is in the range of 1.3 ~ 1.7, and the parameters of each process Strict control is carried out to avoid segregation and liberation of silicon, and to make the silicon and magnesium form a beneficial Mg2Si strengthening phase.
If such a silicon corrosion point is found, special attention should be paid to the surface treatment. In the process of degreasing and degreasing, use a weak alkaline bath as much as possible. If the conditions are not allowed, it should be soaked in the acid degreased liquid. Minimize (qualified aluminum alloy profiles in acid degreasing solution for 20 to 30 minutes without problems, and problematic profiles can only be placed for 1 to 3 minutes), and the pH of the subsequent washing water is higher (pH>4, control Cl-content), prolong the corrosion time in the alkali corrosion process, use the nitric acid photo-liquid when neutralizing the light, and oxidize as soon as possible during the anodizing of the sulfuric acid, so that the dark gray corrosion point caused by silicon is not obvious Can meet the requirements for use
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