The Relation between Cracking and Internal Stress in Microcracked Chromium Deposits

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Abstract
Stress measurements have been made on chromium electrodeposited from electrolyte solutions known to give microcracked plate. Graphs drawn of mean stress v thickness have an inflexion at the deposit thickness where general microcracking was first observed to occur. However, the onset of microcracking was revealed much more clearly in the curves of instantaneous stress v thickness, in which a sharp drop in stress was found to occur simultaneously with a sudden, large increase in crack density. Increasing the sulphuric acid content of the solution was observed to decrease the thickness at which the microcracking first occurred, with a concurrent drop in stress; increasing the concentration of trivalent chromium had the opposite effect. Microcracking was seen to take place at the same thickness on nickel and steel substrates; the effect on stress at that thickness was also the same, in spite of the dissimilarity of the initial stress/thickness curves for chromium deposited on these basis metals.

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