SEDL / STP / STP978-EB / STP26202S

Galvanic Corrosion Resistance of Welded Dissimilar Nickel-Base Alloys

Corbett, RA
President and vice-president, Corrosion Testing Laboratories, Inc., Newark, DE

Morrison, WS
President and vice-president, Corrosion Testing Laboratories, Inc., Newark, DE

Snyder, RJ
Maintenance engineer, E. I. du Pont de Nemours & Co., Inc., Wilmington, DE

Pages: 11    Published: Jan 1988

Download this paper for $25 PDF (176K)          View License Agreement
Abstract

A program for evaluating the corrosion resistance of various dissimilar welded nickel-base alloy combinations is outlined. Alloy combinations included Alloy ALLCORR, Alloy C-276, Alloy 72, and Alloy 690. The gas tungsten arc weld (GTAW) process involved both high and minimum heat input conditions. Specimens were evaluated in the as-welded condition, as well as after having been aged at various conditions of time and temperature. These were judged to be most representative of process upset conditions, which might be expected. Corrosion testing evaluated resistance to an oxidizing acid and a severe service environment in which the alloy combinations might be used. Mechanical properties are also discussed.