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Metal members are joined through a method which comprises: a step wherein the surface of a first metal member that is formed of aluminum is immersed in an alkali solution or exposed to a vapor that contains an alkali
a subsequent step wherein the surface of the first metal member is boiled in an organic acid solution or exposed to a vapor that contains an organic acid
and a subsequent step wherein the surface of a second metal member is abutted to the surface of the first metal member and heat and pressure are applied thereto, thereby joining the first metal member and the second metal member with each other.
