| 摘要 |
This Zn-Mg alloy coated steel sheet is provided with: a steel sheet; a Zn-Mg alloy coating layer that is formed on the surface of the steel sheet and contains 10-70% by mass of Mg, with the balance made up of Zn and impurities; a corrosion product layer that is formed on the surface of the Zn-Mg alloy coating layer and contains an Mg salt of a carboxylic acid having 4-20 carbon atoms or an Mg salt of an alkanesulfonic acid having 4-20 carbon atoms; and a chemical conversion coating layer that is formed on the surface of the corrosion product layer and contains an alkali metal salt of the carboxylic acid in cases where the corrosion product layer contains an Mg salt of the carboxylic acid, while containing an alkali metal salt of the alkanesulfonic acid in cases where the corrosion product layer contains an Mg salt of the alkanesulfonic acid. In this connection, the alkali metal of the alkali metal salt of the carboxylic acid or the alkali metal salt of the alkanesulfonic acid contained in the chemical conversion coating layer is at least one element selected from the group consisting of Li, Na, K, Rb and Cs. |
