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Cerium conversion treatment was applied on magnesium coatings in a solution containing CeCl3.The composition of the cerium conversion layer on magnesium was investigated using X-ray photoelectron spectroscopy(XPS).It was revealed that the composition predominately consisted of a three-valent state cerium compound with a relative abundance around 90%.Some of Ce3+ was oxidized to Ce4+.Electrochemical impedance spectroscopy results revealed that the total impedance of cerium-treated samples increased for a short immersion time in NaCl solution before coating deteriorating.This deterioration was due to the coating porosity increasing and the breakdown of the conversion layer.
Cerium conversion treatment was applied on magnesium coatings in a solution containing CeCl3. The composition of the cerium conversion layer on magnesium was investigated using X-ray photoelectron spectroscopy (XPS). It was revealed that the composition predominately consisted of a three-valent state cerium Compound with a relative abundance around 90%. Home of Ce3 + was oxidized to Ce4 +. Electrochemical impedance spectroscopy results revealed that the total impedance of cerium-treated samples increased for a short immersion time in NaCl solution before coating deteriorating. This deterioration was due to the coating porosity increasing and the breakdown of the conversion layer.