Relaxation of Residual Stresses in Brush-Plated Gold and Silver Coatings on Copper and on Brass Substrates

Author:

Lille Harri1,Kõo Jakub1,Ryabchikov Alexander1,Reitsnik Renno1,Sergejev Fjodor2,Dong Min Jie2

Affiliation:

1. Estonian University of Life Sciences

2. Tallinn University of Technology

Abstract

The investigated brush-plated gold and silver coatings are used for repairing the commutators of generators and sliding contacts. Tensile residual stresses generated in the plated coatings were determined by the curvature method and by instrumented indentation testing of a thin-walled open ring substrate, as described in our earlier papers. These stresses relax over time and their dependence on relaxation time was approximated by a linear-fractional function. The Young ́s modulus and nanohardness of the coatings were determined. The surface structure and cross section of the coated substrates were studied.

Publisher

Trans Tech Publications, Ltd.

Subject

General Engineering

Reference8 articles.

1. H. Lille, J. Kõo, A. Ryabchikov, R. Reitsnik, R. Veinthal, V. Mikli, F. Sergejev, Investigation of Residual Stresses and Some Elastic Properties of Brush-Plated Gold and Silver Coatings, Key Engineering Materials, Engineering Materials and Tribology 527 (2013).

2. H. Lille, J. Kõo, A. Ryabchikov, Measurement of Residual Stresses in Different Electrochemical Metallized Coatings, Proceedings of the Lithuanian Academy of Sciences. Materials Science (Medžiagotyra) 4 (2002) 417–420.

3. H. Lille, J. Kõo, T. Pihl, Measurement of Residual Stresses in Brush-Plated Gold and Silver Coatings on Thin Cross-Cut Ring Substrate, Latvian Journal of Chemistry (Latvias Kimijas Žurnals) 1 (2008) 48–54.

4. R. Weil, The origin of stresses in electrodeposits. Review of the Literature Dealing with Stress in Electrodeposited Metals. Part I. Plating 57 (12) (1970) 1231-1237.

5. C. Klein, G. Cardinale, Young's Modulus and Poisson's Ratio of CVD Diamond, Pros SPIE 1759 (1992) 178-193.

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