Abstract：The influence of heating time on the surface color difference of hot formed parts with Al-Si coating was analyzed and verified through the field test of heating process. Moreover, the surface color difference of Al-Si coated hot formed parts caused by oil, foreign matter contamination and laser blanking as well as their influence was analyzed. The results showed that when the steel grade, thickness specification and heating temperature were the same, there would be color difference on the surface of the parts produced with different heating time. With the extension of heating time, the surface color of the parts changed in the cycle between blue, gray, yellow and brown. When the heating temperature and heating time were similar, the surface color of Al-Si coated parts with different steel grade and thickness would be also different due to the difference of iron diffusion to the coating and iron oxidation degree. The color difference caused by heating process had little effect on the mechanical properties of the hot-formed parts of Al-Si coating. With the increase of heating time, however, the diffusion layer was gradually thickened, and the coating layer became loose and porous. The surface color difference caused by oil had no obvious difference from the normal surface in coating thickness, coating morphology and surface resistance, and had little effect on the subsequent welding and coating anticorrosion properties of parts. The surface color difference caused by oil pollution, Zn powder particles and other foreign bodies had little effect on the coating quality. The surface color difference of hot-formed parts caused by laser drop spot ablation should be avoided by optimizing the process control and standardizing the equipment operation.
陈波, 董伊康, 尹树春, 翟昌源, 刘涛, 张俊杰. 铝硅镀层热成形零件表面色差分析[J]. 冶金分析, 2023, 43(10): 75-83.
CHEN Bo, DONG Yikang, YIN Shuchun, ZHAI Changyuan, LIU Tao, ZHANG Junjie. Discussion on surface color difference of hot formed parts with Al-Si coating. , 2023, 43(10): 75-83.
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