The Relation Between the Microstructure of Aluminum Alloy 7075-T6 and the Type of Cerium Salt in the Formation of the Cerium Conversion Layer

The deposition of the cerium conversion layer on aluminum alloy 7075-T6 proceeds by a simple procedure immersion, but it is affected several factors which govern its corrosion protectiveness. study aimed to investigate two crucial relationships: (i) how type salt used for affects composition, thickness, and electrochemical characteristics deposited layers, (ii) depends intermetallic particles. Four sets samples were prepared immersion in 0.1 M NaCl with without adding 3 mM Ce(III) salts: chloride, nitrate, acetate. Samples analyzed scanning electron microscopy chemical analysis at same site before after immersion. Therefore, this site-specific targets mode Ce-conversion as function particle’s type. anion Ce path formation. protectiveness highest acetate salt. model was postulated, describing precipitation mixed dynamic “two-way road” process selectively dissolving elements from substrate precipitating Ce-hydroxide. Dealloying particles governing mechanism large Ce-containing deposits.