巯基有机硅溶胶-凝胶涂层对铜合金H90的腐蚀防护性能研究

Corrosion Protection of Copper Alloy H90 by Mercapto Functionalized Organosilicone Sol-Gel Coating

目的研究巯基有机硅溶胶-凝胶涂层对铜合金H90的保护性能。方法以不同比例的巯基丙基三甲氧基硅烷(MAPMS)与正硅酸乙酯(TEOS)为前驱体,以乙酸作为催化剂,制备含巯基官能团的溶胶-凝胶,并通过浸涂法将该溶胶-凝胶涂层施加到铜合金H90上,并在120℃下烘干成膜。利用电化学、盐雾、接触角等一系列的手段考察巯基有机硅溶胶-凝胶涂层在铜合金H90基材上的防腐蚀、疏水性、铅笔硬度等性能。结果当MAPMS与TEOS物质的量比达到1.5∶1时,自腐蚀电流密度为1.16×10^(-8) A/cm^2,膜层铅笔硬度可达5H,在H90黄铜上的附着力等级达到0级,具有最佳的防腐蚀性能。中性盐雾测试中,物质的量比为1∶1的测试组在第8 d时出现了少量腐蚀斑点,但在接下来的30 d内,腐蚀并未扩大;其他测试组在30 d测试中,未出现明显腐蚀。结论巯基有机硅溶胶-凝胶涂层具有良好的硬度以及附着力,并能显著提高铜合金H90表面防腐蚀性能。

The work aims to study the protective properties of mercapto-organosilica sol-gel coating on copper alloy H90.Mercapto sol of mercaptopropyltrimethoxysilane(MAPMS)and ethylorthosilicate(TEOS)in different proportions were used as precursors and acetic acid was taken as catalyst to prepare the mercapto of functionalized organosilicone sol-gel.The as-prepared organosilicone sol-gel was coated on copper alloy H90 by dip coating and dried at 120℃.The electrochemistry,salt spray,contact angle,etc.,were used to study the corrosion resistance,hydrophobicityand,pencil hardness of mercapto functional sol-gel coating.When the molar ratio of MAPMS:TEOS reached 1.5:1,the coating obtained the best corrosion resistance and the self-corrosion current density was 1.16×10^-8 A/cm^2,the pencil hardness of coating was 5H and the adhesion grade reached level 0.In neutral salt spray test,the test group with the molar ratio of 1:1 had a few spots on the 8th day,but the corrosion did not expand in the next 30 days.The other test groups did not have obvious corrosion during 30-day test.The mercapto-organosilicone sol-gel coating has good hardness and adhesion and can significantly improve the corrosion resistance of copper alloy H90.