Chromium-free passivation liquid for cleaning of refrigerating pipe fitting

Abstract

Disclosed is chromium-free passivation liquid for cleaning of a refrigerating pipe fitting. The chromium-free passivation liquid is formed by the following raw material formula components, by mass percentage, 10-15 parts of nonylphenol polyoxyethylene ether, 10-15 parts of dimethylformamide, 5-10 parts of 2-mercaptobenzothiazolyl, 5-8 parts of melamine, 10-20 parts of sodium sulfate, 8-10 parts of hexafluorozirconic acid, 25-30 parts of polymers with 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid monosodium salt, 10-15 parts of zinc methacrylate, 3-5 parts of benzilic acid, 50-80 parts of phenethyl alcohol, 50-80 parts of benzopinacole, 80-120 parts of pyrazine, 100-120 parts of polyethylene glycol octylphenol ether and 250-300 parts of deionized water. The chromium-free passivation liquid for cleaning of the refrigerating pipe fitting can meet the requirement for high cleanness, enables the refrigerating pipe fitting to have good corrosion resistance, and is beneficial to environmental protection and simplification of the operation technology.

Description

technical field [0001] The invention relates to the technical field of a passivator for copper pipe fittings, in particular to a chrome-free passivation solution for cleaning refrigeration pipe fittings. Background technique [0002] The main material of refrigeration pipe fittings is copper and its alloys. Because O2 in the air is easy to react with copper, the surface turns black, which affects its appearance and thermal conductivity. Therefore, passivation treatment must be performed on refrigeration pipe fittings. However, at present, there are relatively few domestic research results on cleaning liquid for refrigeration pipe fittings, and there is no cleaning liquid that can clean copper well, and its use and performance stability have not been guaranteed to a certain extent. It failed to meet the high-standard cleanliness requirements of refrigeration equipment, let alone the passivation treatment requirements for refrigeration pipe fittings. Contents of the inventio...

AI Technical Summary

Problems solved by technology

However, at present, there are relatively few domestic research results on cleaning liquid for refrigeration pipe fittings, and there is no cleaning liquid that can clean copper well, and its use and performance stability have not been guaranteed to a certain extent. Failure to meet the high-standard cleaning requirements of refrigeration equipment, let alone the passivation treatment requirements for refrigeration pipe fittings