SEDL / STP / STP646-EB / STP27323S

Atmospheric Corrosion Behavior of Aluminum-Zinc Alloy-Coated Steel

Zoccola, JC
Corrosion mechanisms engineer, corrosion mechanisms supervisor, hot-dip coatings supervisor, and corrosion prevention and coatings manager, Bethlehem Steel Corp., Bethlehem, Pa

Townsend, HE
Corrosion mechanisms engineer, corrosion mechanisms supervisor, hot-dip coatings supervisor, and corrosion prevention and coatings manager, Bethlehem Steel Corp., Bethlehem, Pa

Borzillo, AR
Corrosion mechanisms engineer, corrosion mechanisms supervisor, hot-dip coatings supervisor, and corrosion prevention and coatings manager, Bethlehem Steel Corp., Bethlehem, Pa

Horton, JB
Corrosion mechanisms engineer, corrosion mechanisms supervisor, hot-dip coatings supervisor, and corrosion prevention and coatings manager, Bethlehem Steel Corp., Bethlehem, Pa

Pages: 20    Published: Jan 1978

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Abstract

The influence of the aluminum content of hot-dip aluminum-zinc alloy coatings on their corrosion behavior was studied by means of salt-spray and atmospheric corrosion tests. The objective was to develop an improved aluminum-zinc alloy coating on steel that would be more durable than galvanized coatings and that would be more protective to cut edges and areas of mechanical damage than hot-dip aluminum coatings. The optimum alloy was found to be 55 weight percent aluminum-zinc. This new alloy coating is two to four times as corrosion-resistant as a galvanized coating of similar thickness. Furthermore, for the galvanic protection of cut edges of sheet in some environments, this coating proved to be superior to aluminum coatings.