铝粉对醇溶性无机富锌漆性能的影响

Effect of Aluminum Powders on Properties of Alcohol-soluble Inorganic Zinc-rich Coating

研究了醇溶性无机富锌漆中球状锌粉质量的5%、10%、15%、20%、25%和30%被铝粉取代对涂层性能的影响。通过开路电势一时间曲线研究了涂层在3.5%NaCl溶液中电化学活性的变化情况,同时记录了涂层的耐盐水浸泡时间;采用盐雾试验研究了涂层的耐盐雾时间。结果显示:涂层的耐盐水和耐盐雾时间随取代比增加都是先延长后缩短,在15%达到最大值。涂层的阴极保护时间与屏蔽保护时间呈现同样的变化规律。

The effect of replacing 5, 10, 15, 20, 25 and 30wt% of spherical shaped zinc powders in alcohol-soluble inorganic zinc-rich coating with aluminum powders on performances of the coatings was studied. The open circuit potentials of coatings in 3.5% NaCl solution versus time were recorded to reveal the evolution of their electrochemical activities and how long the coatings can protect steel substrate in NaCl solution was tested. How long the coatings can protect steel substrate in salt spray test was also recorded. Experimental results showed that life time of the coatings in NaCl solution and in salt spray with the increase in content of aluminum powders was prolonged firstly, then shortened, and it reached its maximum value at 15%. The same rule can be seen on the life time of galvanic protection and the life time of barrier protection of the coatings.