Chemical and Biomolecular Engineering Faculty Research

Title

Water Staining of Al 3104-h19 Can Body Stock: a Crevice Corrosion Study Utilizing the Double Crevice Assembly Test Method

Document Type

Article

Publication Date

Summer 1997

Abstract

An electrochemical technique was developed to detect the initiation and monitor propagation of water staining on Al 3104-H19 (UNS A93104). Water staining is a crevice corrosion phenomenon occurring between adjacent layers of coiled aluminum can stock in the presence of a condensed water phase. One of the main forms of water stain prevention consists of electrostatic application of oil-based post-lubricants to the can stock surface prior to shipment. A double crevice assembly (DCA) method was developed to induce water staining in the laboratory as observed in the field. The relative inhibiting performance of various post-rolling protective lubricants and the susceptibility of various can stock alloying compositions used in the industry then were compared. Susceptibility of a can stock coupon and the ability of a given post-lubricant to inhibit crevice corrosion was related directly related to the water stain initiation time (tstain) detected in the DCA technique by a negative shift in the electrochemical potential of creviced Al 3104-H19.

Volume

53

Issue

8

First Page

644

Last Page

656