KF对钢有强刻蚀性，可形成氟铁酸盐转化膜；且铁锈能与单宁酸配位形成有机保护膜。以KF，HNO3，单宁酸，Cr（NO3）3等组成转化液，在Q195冷轧钢表面制备了无机．有机复合转化膜。通过中性盐雾试验、电化学测试、百格法测试、扫描电镜（SEM）、能谱（EDS）和红外光谱分析了复合转化膜的耐蚀性能、结合性能、形貌、成分和分子结构。结果表明：复合转化膜由氟铁酸钾、单宁酸-Fe^3＋配位化合物和单宁酸-Cr3^＋配位化合物组成，耐盐雾时间可达9.0h，与基体结合良好。
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