Plant trials of an electroplated iron-zinc alloy coating were conducted in France on a U. S. Steel Corporation licensed CAROSEL facility. Plating electrolyte and line conditions were studied to develop optimum conditions for producing a 10 to 20 percent iron-zinc alloy coating. The product involved two-side alloy coatings as well as alloy on one surface and zinc on the other surface. A chloride plating electrolyte and soluble anodes were employed. Experience gained from the trials is being used to help design the new electrogalvanizing facility being built by U. S. Steel and Rouge Steel.