Electrochemical Acceleration of Phosphating Processes

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Abstract
The application of anodic currents during the first stage of chemical immersion phosphating has been studied in terms of potential-time behavior, coating weight development and coating porosity. By use of a small current (0.5-2.0 mA cm−2) for short times (0.5-2.5 min) in an otherwise standard process cycle very high coating weights can be attained and the porosity of the final coating markedly improved.