涂料稀释对碳钢表面金属铝涂层性能的影响研究

Study on the effect of paint dilution on the performance of metallic aluminum coating on carbon steel surface

摘要:

为模拟工业生产制备铝浆过程中可能出现的误差，对原始底层和顶层铝浆涂料用水进行了稀释实验，希望得到不破坏涂层防腐性能前提下允许稀释的最大加水量．研究的原始底层铝浆涂料加水量分别为10%,30%和50%，研究的原始顶层铝浆涂料加水量分别为10%,20%和30%．研究结果表明，原始底层和顶层铝浆涂料水稀释量不超过铝浆质量的10%时，涂层的防腐蚀性能不会明显降低．浸泡模拟海水过程中，无论是底部还是顶部涂料稀释，只要试样厚度不随时间明显减小，涂层都能对钢基体起好的保护作用，使之不被模拟海水腐蚀．电化学极化曲线研究发现，底部和顶部涂层抗模拟海水腐蚀效率分别为88%和98%，顶部铝粉涂层对碳钢基体防模拟海水腐蚀作用比底部铝粉涂层更好．XRD分析表明，底部和顶部涂层都由金属铝组成，没有氧化铝．

Abstract:

In order to simulate the possible errors in the process of preparing aluminum slurry in industrial production, dilution experiments were carried out on the original bottom layer and the top layer of aluminum slurry coating with water, hoping to get the maximum amount of water that can be diluted without damaging the corrosion resistance of the coating. The water content of the original bottom layer aluminum slurry coating was 10%, 30% and 50%, respectively, and the water content of the original top layer aluminum slurry coating was 10%, 20% and 30%, respectively. The results show that the corrosion resistance of the coating will not be significantly decreased when the water dilution of the coating does not exceed 10% of the aluminum mass of the coating. During the immersion in simulated seawater, no matter the bottom or top coating is diluted, as long as the thickness of the sample does not decrease significantly with time, the coating can play a good role in protecting the steel matrix from corrosion by simulated sea water. Electrochemical polarization curves show that the corrosion resistance of bottom and top coatings is 88% and 98%, respectively. The corrosion resistance of top coating is better than that of bottom coating on carbon steel. XRD analysis shows that both the bottom and top coatings are composed of metallic aluminum without aluminum oxide.