摘要
为了提高碳钢表面硅烷膜的性能、获得较佳的硅烷化工艺,以Q235钢为基材,硅烷偶联剂γ-氨丙基三乙氧基硅烷(KH550)、钼酸钠等为原料,在Q235钢表面制备钼酸盐改性硅烷膜,并用正交试验及电化学测试对主工艺参数进行优化。结果表明:钼酸盐硅烷化最佳工艺为30 g/L钼酸钠,50 mL/L KH550,V(乙醇)∶V(水)为55∶45,pH值11,KH550水解时间48 h;Q235钢经最佳工艺处理后,其表面形成了一层白色的钼酸盐改性硅烷膜,使Q235钢的自腐蚀电位正移了0.530 V,自腐蚀电流密度下降了95.2%,耐蚀性增强。
Orthogonal tests and electrochemical tests were conducted to optimize the major parameters for silanization of Q235 carbon steel substrate in the presence of silane coupling agent 3-aminopropyl triethoxysilane (KH550) as the silanization agent and sodium molybdate as the modifying agent. The corrosion resistance of as prepared modified silane film under the optimized silanization condition was evaluated. Results indicated that the optimized silanization fluid consisted of 30 g/L sodium molybdate,50 mL/L KH550,and ethanol-water with a volume ratio of 55 ∶ 45; and the optimized silanization parameters were suggested as pH value of 11 and KH550 hydrolysis time of 48 h. A white layer of molybdate-modified silane film was formed on the surface of Q235 steel after silanization under the optimal condition. The corrosion potential of as-obtained molybdate-modified silane film was positively shifted by 0. 530 V,and its corrosion current density was reduced by 95. 2%,showing improved corrosion resistance.
出处
《材料保护》
CAS
CSCD
北大核心
2013年第5期30-32,2+1,共3页
Materials Protection
关键词
钼酸盐改性硅烷膜
Q235钢
钼酸钠
正交试验
工艺优化
耐蚀性
silane film modified by molybdate
Q235 steel
sodium molybdate
orthogonal tests
optimization
corrosion resistance
作者简介
[通信作者]熊金平（1963-），副教授，主要研究方向为金属腐蚀与防护，电话：010—64434908，E—mail：xiongjp@mail．buct．edu．cn
