Magnesium alloy/resin composite structure and method for manufacturing the same

A method for manufacturing a magnesium alloy/resin composite structure,

• wherein the magnesium alloy/resin composite structure comprises:
• a magnesium alloy member;
• and
• a resin member integrated to the magnesium alloy member and made of a thermoplastic resin composition,
• wherein a surface of the magnesium alloy member, to which the resin member is not integrated, is coated with a layer including a manganese atom, an oxygen atom, and a sulfur atom, and
• wherein a surface of the magnesium alloy member, to which the resin member is integrated, is coated with a layer not including a sulfur atom and including a manganese atom and an oxygen atom,
• the method comprising:
• a step of preparing a magnesium alloy member,
• a step of chemically etching the magnesium alloy member with an acidic aqueous solution to obtain a chemically etched magnesium alloy member on which fine protrusion and recess structure is formed, and then subjecting the chemically etched magnesium alloy member to a chemical conversion treatment with a permanganate aqueous solution, thereby obtaining the magnesium alloy member on which a manganese oxide-containing layer is formed through the fine protrusion and recess structure, where the manganese oxide-containing layer is not including a sulfur atom and including a manganese atom and an oxygen atom,
• a step of integrating a resin member to one surface of the magnesium alloy member on which the manganese oxide-containing layer is formed to obtain an integrated body, and
• a step of treating a non-resin-member-integrated portion of the integrated body with an aqueous composition including a hydroxylamine hydrosulfate to obtain a magnesium alloy/resin composite structure, wherein a surface of the magnesium alloy member, to which the resin member is not integrated, is coated with a layer including a manganese atom, an oxygen atom, and a sulfur atom