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.

Subject
Water, Aluminum, Metal coupons, Aqueous environments, Corrosion initiation, Waves, Bulk solution, Lubricants, Crevices, Silicon, Crevice corrosion, Corrosion coupons, Corrosion potential
Keywords:
Al 3104-H19, aluminum, can stock, capillary electrophoresis, crevice corrosion, post-lubricating oils, solution ion analysis, water staining
NACE International
1997
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