51314-4124-Insitu-Hydrogen Permeation Measurement during ZnNi Plating of High Strength Steel and Correlation with the Likelihood of Embrittlement

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Product Number: 51314-4124-SG

ISBN: 4124 2014 CP

Author: Guenter Schmitt

Publication Date: 2014

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Hydrogen uptake during electrochemical metal plating of high strength steels can cause severe embrittlement depending on the plating parameters. Insitu H-permeation measurements have been performed during electrochemical deposition of ZnNi coatings on 100 µm membranes of high strength steel (yield strength 2600 MPa) in order to evaluate non-critical plating conditions. For characteristic plating parameters a hydrogen balance was made up over the whole plating period by estimating the total amount of hydrogen electrochemically produced measuring the total amount of permeated hydrogen and finally calculating the percentage of permeated hydrogen related to the total amount of electrochemically produced hydrogen. These data were correlated with the intensitity of hydrogen embrittlement of notched round tensile specimens plated under the same conditions and the degree of embrittlement was correlated with the amount of hydrogen effusible from the notched tensile specimes at temperatures up to 210°C. Systematic investigations revealed process conditions which allow the plating of high strength steel with ZnNi coating without creating hydrogen embrittlement. The results are compared with plating processes for the deposition of zink nickel and cadmium.