Title: Designing for the cerium‐based conversion coating with excellent corrosion resistance on Mg–4Y–2Al magnesium alloy
Abstract: Abstract The cerium salt chemical conversion baths containing KMnO 4 are applied to prepare protective coatings on the WA42 alloy surface, and the effect of the concentration of KMnO 4 on the microstructure and corrosion properties of the coatings is investigated by scanning electron microscopy, X‐ray photoelectron spectroscopy, and electrochemical tests. The results indicate that with the addition of KMnO 4 to the conversion bath, the microstructure of the coating is more uniform and denser, and the coating with the KMnO 4 concentration of 4 g/L (4M coating) has the most uniform microstructure with the least microcracks. The 4M coating exhibits a two‐layered structure, and it is mainly composed of MgO, Mg(OH) 2 , CeO 2 , Ce 2 O 3 , Ce(OH) 3 , MnO, and MnO 2 . In addition, as the KMnO 4 concentration increases from 0 to 6 g/L, the I corr of the coatings in 3.5% NaCl solution decreases first and then increases, and the 4M coating shows the best corrosion resistance, which should attribute to the uniform and dense microstructure.
Publication Year: 2020
Publication Date: 2020-12-14
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 5
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