Effect of Phosphate Source on Post-Treatment of Cerium-Based Conversion Coatings on Al 2024-T3
作者： Daimon K Heller , William G. Fahrenholtz , Matthew J. O’Keefe
DOI: 10.1149/1.3224005
关键词:
摘要: The surface morphology, electrochemical characteristics, and salt spray corrosion performance were studied for cerium-based conversion coatings on Al 2024-T3 that post-treated in heated aqueous solutions of orthophosphate, pyrophosphate, polyphosphate compounds. Phosphate post-treatment reduced cracking the coatings, which resulted better protection compared to highly cracked or contained other defects. In addition, orthophosphate converted as-deposited hydrated cerium oxide CeP0 4 , further improved protection. Electrochemical analyses showed phosphate after had highest resistance (∼100 kΩ cm 2 ), most noble pitting potentials (∼―270 mV), best post-treatments tested. While pyrophosphate cracks they did not promote formation phosphate. results suggest is dependent both morphology phase coating.
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