Acetylenic Alcohol-Inhibited Pickling Bath As a Pretreatment Prior to Lining Steel Pipe★

Abstract

Abstract Test results on steel panels confirm that acetylenic alcohols when used as inhibitors in pickling baths provide a substrate which will increase the corrosion inhibition of epoxy-phenolic systems under extreme immersion conditions. It was found that this substrate under test conditions provided protection equal to or superior to that provided by lightweight zinc phosphate pretreatment. Certain postulated reactions are offered to explain this phenomenon. It is possible that the mechanism is tied in with acid and hydrogen embrittlement inhibitive properties. Data reported include the effect of differing metal surface treatments on the corrosion-resisting properties of epoxyphenolic coating systems, the effect of lead ion on the corrosion resistance of pickled coated panels, and results of hydrogen embrittlement bend test for acetylenic alcohol concentration. This study was conducted primarily to improve the corrosion resistance of coated steel pipe carrying hot potable water. 5.9.2