30CrMnSiNi2A钢紧固件磁控溅射铝膜的腐蚀和氢脆性能

Corrosion Resistance and Hydrogen Embrittlement Performance of Al Film Deposited by Magnetron Sputtering on Fasteners of 30CrMnSiNi2A Steel

为提高30CrMnSiNi2A螺栓紧固件的耐腐蚀性能，采用磁控溅射技术在30CrMnSiNi2A试样和螺栓表面制备铝薄膜。采用SEM观察铝膜层的微观形貌。选取与镀铝薄膜厚度相同的氰化镀锌试样为对比件，采用电化学工作站和中性盐雾试验测试薄膜的耐腐蚀性能；采用氢脆试验测试基体和镀铝后处理试样的氢脆性能。结果表明：螺栓表面铝薄膜的厚度为7．26～10．47μm，厚度不均匀性为±17．2％；镀铝薄膜的螺栓耐盐雾腐蚀性能比氰化镀锌的耐腐蚀性能好；化学转化后处理和喷丸＋化学转化复合后处理的镀铝螺栓的耐盐雾腐蚀性能优异，自腐蚀电流与30CrMnSiNi2A基体相比下降了1-2个数量级；磁控溅射镀铝薄膜和后处理工艺对30CrMnSiNi2A钢基体的氢脆性能没有影响。

The Al film was prepared by magnetron sputtering on 30CrMnSiNi2A specimens and bolts in order to improve the corrosion resistance of the bolts. The surface and cross section morphology of the Al film were observed by SEM. The cyanide zinc plating samples with the same thickness of Al films were chosen as comparison in this paper. The anti-corrosion performance of the samples with different treatment types were measured by electrochemical working station and neutral salt spray test. The hydrogen embrittlement performance of the substrate and the Al film was measured by hydrogen embrittlement test. The results show that the thickness of films on the blots is 7.26-10.47 μm, and the non-uniform of film thickness on bolts is ±17.2%. The corrosion resistance performance of the bolts coated by Al film is much better than that of the cyanide zinc plating. The bolts treated by chemical conversion and compound of blasting and chemical conversion show excelnt anti- corrosion performance, and the self etching current is reduced about one or two orders of magnitude. The Al films deposited by magnetron sputtering and the post treatment processing have no effect on hydrogen embrittlement of 30CrMnSiNi2A steel.