PIPE PROVIDED WITH CORROSION PREVENTION LAYER ON THE OUTSIDE SURFACE, PROCESS FOR PRODUCTION OF THE SAME, AND PROCESS FOR PRODUCTION OF ALLOY WIRES TO BE USED FOR CORROSION PREVENTION OF OUTSIDE SURFACE OF THE PIPE

摘要

the present invention is composed of an iron-based material in the pipe by way of the surface layer is formed there . The system layer , and Sn is more than 1 mass %, and is less than 50 mass %, and containing Zn-Sn -based thermal spray coating of the balance of Zn. Another way is to Sn layer is more than 1 mass %, and is less than 50 mass %, Mg exceeds 0.01 mass %, and is less than 5 mass% , the balance of Zn containing a Zn-Sn-Mg -based sprayed coating The . System containing at least one of a coating layer of Ti, Co, Ni, P , and spraying , the content of each exceeds 0.001 mass %, and preferably less than 3 wt %. ;