Determination of the Modulus of Elasticity, Poisson´s Ratio and the Coefficient of Thermal Expansion of Electrochemically Metallized Nickel Coatings
Keywords:nickel coating, strain gauge, elastic modulus, Poisson’s ratio, coefficient of thermal expansion, uncertainty.
A four-point bending method is developed for determination of the modulus of elasticity and Poisson`s ratio in a nickel coating deposited by electrochemical metallizing from a sulphate electrolyte on a brass strip substrate. For determination of the coefficient of thermal expansion the strip substrate was heated with and without the coating. The method involves use of strain gauges that are attached on the free surfaces of substrate and the coating. The sensitivity of the method was studied and the uncertainty of the computed mean values of the modulus of elasticity, Poisson’s ratio and the coefficient of thermal expansion are presented.
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