| 摘要 |
PROBLEM TO BE SOLVED: To prevent the detachment of a tin-plated layer and to improve the corrosion resistance with respect to a joint for copper or copper alloy tube coated with tin on the inner surface which is formed by bulging. SOLUTION: Carbon quantity on the inner surface is reduced to <=3μg/cm<2> by polishing and/or etching the inner surface of the joint base stock composed of the copper or copper alloy tube. Successively, this joint base stock is bulged to form the joint shapes and thereafter, the tin plating having 0.1-5μm thickness, is applied to make the joint for copper or copper alloy tube alloy tube with the tin on the inner surface.
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