| 摘要 |
<p>An anticorrosive coated steel pipe comprises an electroplated copper layer (2) formed on the external surface of the steel pipe (1); and electroplated zinc layer (3) bonded, via a plated nickel or iron layer (4), to the surface of the electroplated copper layer (2); and a baked outer layer or finish (5) formed on the surface of the electroplated zinc layer (3). A chromate layer is optionally provided between the electroplated zinc layer (3) and the baked coating (5). The plated nickel or iron layer (4) interposed between the electroplated copper layer (2) and the electroplated zinc layer (3) completely suppresses mutual diffusion between the two electroplated layers, thereby preventing local blistering, cracking and peeling in the outer layer during baking, and eliminating the possibility of the outer layer peeling off during subsequent bending operations. The value of final products, as well as resistance to corrosion and impact, can thus be greatly enhanced. <IMAGE></p> |
