Nickel-based composite layers electrochemically deposited on steel are known as materials of special properties like very good corrosive resistance or high catalytic activity in hydrogen evolution. Especially interesting are those containing metals like Ti, Mo, W (e.g. Mo plays a role of an activator in the hydrogen electroevolution).
The aim of the paper is to study Young modulus and adhesion coefficient (defined as a fraction of mechanical energy transferred from substrate to layer) for Ni+Mo composite layers electrochemically deposited on stainless steel. The layers (20 and 50 µm) were prepared by electrodeposition of nickel from a nickel bath containing Mo particles. The structural and electrochemical examinations of these kinds of layers were published in [1].
Young modulus E and adhesion coefficient of the composite layers were determined versus temperature (300-600 K, heating rate 3 K/min) using a vibrating reed apparatus. Samples in form of a plate (70x7x0.5 mm3) with the Ni+Mo layer on one side were excited into flexural vibrations with the resonant frequency of about 100 Hz. The measurements of resonant frequency vs. temperature allow determining the Young modulus of the layer material. It was shown that E continuously decreases with temperature and the Ni+Mo layers are thermally stable up to about 600 K. The Young modulus of the layer strongly decreases with increasing Mo content. The relative adhesion coefficient was determined vs. temperature for layers with the same Mo content and different layer thickness.

1. M.Popczyk, J.Kubisztal, A.Budniok, Materials Science Forum, 514-516 (2006) 1182.

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