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These differences include excessively rusted surfaces, pitted surfaces, machined surfaces, cast iron especially with sand inclusion, cast steel, malleable iron, hot-rolled steel, and cold-rolled steel. Whenever different analyses of steel or different surfaces of steel are united in an assembly the galvanized finish is not generally uniform in appearance. Assemblies should consist of elements of similar chemistry and surface condition. This practice covers the precautions that should be taken to obtain high-quality galvanized coatings.
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