利用浸涂法在Q235钢表面制备无铬锌铝涂层,并在涂层中添加TiO2纳米颗粒制备TiO2纳米复合涂层.采用SEM、EDS等测试手段分析两种涂层的组织、形貌和成分,并通过快速硝酸铵腐蚀实验以及电化学实验研究涂层的耐蚀性能.结果表明:涂层呈层片状组织,纳米颗粒部分填充在金属粉的孔隙中.在20％的硝酸铵溶液中腐蚀4h后,TiO2纳米复合涂层仍维持层片状结构,未出现明显的剥落现象,耐蚀性优于无铬锌铝涂层.在3.5％ NaCl溶液中,TiO2纳米复合涂层的自腐蚀电流密度为2.476×10-6 A/cm2,低于无铬锌铝涂层的5.015×10-5 A/cm2,显著提升了涂层的耐蚀性.
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