Method of making corrosion resistant phosphorous copper or phosp

Details Method of making corrosion resistant phosphorous copper or phosp Method of making corrosion resistant phosphorous copper or phosp

1980-08-06

1982-09-28

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

72 41, 134 20, 134 22C, C23F 702

Patent

active

043516785

ABSTRACT:
An improved corrosion resistant pipe and method of manufacture is presented wherein a phosphorus copper or phosphorus copper alloy pipe is subjected to a special heat treatment step which forms an internal oxide coating. A pipe produced in accordance with the invention is characterized as having a carbon content on the inside wall of 0.05 mg/dm.sup.2 or less and an internal oxide coating having a thickness ranging from 0.1 to 5 microns. Notably this improved pipe has a good resistance to corrosion, even when exposed to chemically agressive liquids.

REFERENCES:
patent: 1280825 (1918-10-01), Pacz
patent: 2620286 (1952-12-01), Shaw
patent: 3398028 (1968-08-01), Scott
patent: 3930894 (1976-01-01), Shapiro et al.

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