| abstract |
PROBLEM TO BE SOLVED: To coat a surface of a metal (particularly steel, aluminum and its alloy), for example, an outer surface of a pipe having an outer diameter of 4 to 50 mm with a polyamide-based layer. SOLUTION: A coated metal surface having the following layers in the following order from the metal side: (1) a primer layer formed as needed, (2) a bonding layer provided as needed, (3) A polyamide-based layer consisting of a mixture of a polyamide and a polyolefin functionalized with an unsaturated carboxylic anhydride. Anodized aluminum, zinc or zinc-based alloy (eg Zn-Al or Zn-Fe mixture) Suitable for aluminum or aluminum based alloy coating and / or chromium or phosphoric acid treated steel. Chromium treatment of Cr (III) is preferred. |