Study Of Degreasing For Zinc Substrates

The zinc-substrates get more and more extensive application in industry. The zinc-substrates will be stained with the greasy dirt in the course of processing and transportation, the existence of the greasy dirt has influenced the processing characteristics of substrates, even lead to the failure of coating. Therefore before coating the zinc-substrates must be degreased in order to remove dirt on its surface.The domestic degreasing agent is high alkaline, and include the phosphorus. High Alkaline corrodes zinc-substrates, the waste liquid of degreasing agent including phosphorus pollutes environment. It is important to develop a low alkaline degreasing agent without phosphorus for zinc-substrates.By experiments, the thesis studies the degrease characteristic of different kinds of surface-active agents, and mixture of nonion surface-active agents with the anion, cation and amphoteric surface-active agents, the result of the tests is that the anion surface-active agent 601 improves the degrease rate. Especially the thesis probes into the degrease characteristic of the mixture of three kinds of different kinds of surface-active agents, the study shows: CAB-30 improves the degreasing rate,there is good mixture of nonion surface-active agents JFC-6, Anion surface-active agent 601 and amphoteric surface-active agents CAB-30.The thesis studies degrease rate of various kinds of auxiliary, and inhibiting rate of corrosion inhibitor, Also the study gets zinc-substrates degreaser by orthogonal tests and craft parameters by craft tests.The contents:JFC-6 4g/l601 1g/1CAB-30 2g/lNaAc 1.5g/lTartaric acid sodium 1. 5g/lEDTA 1. 5 g/13-amino-triazole lg/1water otherCraft parameters: temperature 40℃-55℃the time 3 minutes -6 minutesTotal alkaline 5 pt -7.5pt.By comparing domestic and international zinc-substrates degreasing agent to this degreaser, the agent can reach domestic and international degrease rate of degreasing agent, it is superior to the domestic degreasing agent to corrosion rate, degrease time can reach the level of a degreasing agent of domestic and international daily Zinc-substrates degreaser, with low alkaline and without phosphorus.