化学试验镀锌(国外英文资料).docVIP

化学实验镀锌 High gloss non-cyanoalkaline zinc acid zinc Hu hongyi, 200131050037, chemical base class One. The purpose of the experiment Understand the basics of electroplating. Understand the effect of the gloss on the appearance and quality of the zinc coating. Understand the effect of electrolytic conditions on the appearance and quality of the zinc coating. The basic operation method of electroplating is controlled by this test. Two. Experimental meaning and principle Used for over 100 years in the industrial production of cyanide zinc plating, although with some excellent properties, but the plating solution containing highly toxic cyanide, serious influence electroplating of the workers health, also caused the serious pollution of environment, and the resulting coating appearance also not light. Recently started using without cyanide alkaline zinc plating, with condensation product of amine, or aldehyde condensation compound brightener, but these brightener exists in the plating solution, the resulting coating, though there is a certain light, at best only half light, can not meet the requirements of coating decorative light outside. Wuhan university electrochemical plating after a long-term exploration of the lab, developed a without cyanide alkaline zincate solution that can adapt to a wide temperature range, produce high light like a mirror luster galvanized general brightener WD - 99, and has been applied to get the large-scale industrial production. This kind of brightener meets the requirement of coating appearance and quality. In electroplating process, when the composition of plating solution is determined, electrolytic conditions on the appearance and quality. There is, as the electrolytic conditions (cathode current density, stirring, temperature, etc.) change in the appearance and performance of the coating will change accordingly. At the same time, electrolytic conditions often affect current efficiency, sedimentation velocity, dispersion ability and de