7A04铝合金变焦距组件在硬质氧化处理后出现氧化膜局部粗糙、零件腐蚀的现象.为此,对工艺进行了分析,发现影响氧化膜质量的原因为搅拌强度不足,导致零件局部过热.通过提高搅拌强度,变焦距组件氧化膜质量合格.
Cam-varifocal mechanism made of 7A04 aluminum al-loy is liable to local coarsening and corrosion of oxide coatings af-ter hard anodizing. Thus the anodizing process was analyzed, and the causes leading to local coarsening and corrosion of the oxide coatings on the cam- varifocal mechanism were explored. It was found that the poor quality of the anodizing coatings on the Al al-loy was attributed to insufficient agitation, which led to local overheating. It was feasible to prepare cam-varifocal mechanism with qualified anodizing coatings by properly increasing the inten-sity of agitation.
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