Multifunctional solution for cleaning and no-chromium deactivation of no-freon refrigerating pipe

Abstract

The present invention relates to deactivator for refrigerating part of copper, and is especially no-chromium deactivator for refrigerating part of copper. The no-chromium deactivator is the mixture of citric acid, sodium molybdate, urea, benzotriazole, ammonium acrylate, pyrrolidone, benzylalcohol, phenyl glycol ether, phenyl carbitol, amino trimethylene phosphonic acid and water. It is colorless, transparent, non-toxic and harmful multifunctional solution for cleaning and deactivating no Freon refrigerating pipe through soaking or spraying. It has simplified and environment friendly cleaning and deactivating process.

Description

technical field [0001] The invention relates to a passivator for copper refrigeration parts, in particular to a chromium-free passivator for copper refrigeration parts. Background technique [0002] The main material of Freon-free refrigeration pipe fittings is copper and its alloys, but due to the O in the air 2 , CO 2 、H 2 S and SO 2 It is easy to react with copper to make the surface black, which affects its appearance and thermal conductivity, so the cooling pipe must be passivated. At the same time, in order to fulfill the requirements of the "Montreal Protocol on Substances that Deplete the Ozone Layer", domestic refrigeration companies will eventually eliminate ozone-depleting substances in 2010, so in recent years, CFC-free refrigerators (refrigerators, air conditioners) have been introduced. The research found that one of the key technologies of Freon-free refrigerators is the requirement of high cleanliness on the inner wall of the refrigeration tube, specifica...

AI Technical Summary

Problems solved by technology

It is even more unable to meet the passivation requirements for Freon-free refrigeration parts

[0003] In recent years, the research on chromium-free passivation technology at home and abroad is very active. The typical technology and chromium belong to VIA group molybdate, tungstate, rare earth metal salt, etc., but its fields are mainly concentrated in galvanized tin-plated parts, steel And the chromium-free passivation of aluminum and aluminum alloys. For example, Loughborough University in the United Kingdom studied the electrochemical characteristics of molybdate passivation treatment. The results show that molybdate passivation can improve the corrosion resistance of metals such as zinc and tin, but the overall effect is not as good as that of chromium. salt passivation

[0004] In addition, Cowleson DR, Scholefield AR, Passivatio of Tin-Zinc Alloy coatedsteel.Trans IMF.1985, 63(2): 56, etc. studied the method of tungstate passivation Sn-Zn alloy, and studied its anti-humidity cycle test Performance is inferior to molybdate and chromate passivation

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