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Non Uniform colour of anodizing coating 'WITHIN A PIECE'

The material has < 1% of Si, Cu, Mg, Mn altogether. FEW PIECES in a load gets color variation (like patches Light grey and dark grey). When the component is stripped and re-anodized the same pattern of patches appear only on pieces that had problem before. Is it a material problem or process inconsistency? We don't get this problem on other types of components with the same composition. Temperature- 13 C, Current density - 3 amp/dm2

Thank you,

Rajesh Kumar
- India
2001

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