A novel method to measure the residual stress in a corrosion film formed on metallic substrates

This paper theoretically proposed a series of formulae for a novel tensile testing method to extract the residual stress in the surface film on metallic substrates. Finite element calculations were conducted to verify the accuracy and reliability of the proposed formulae. From the tensile stress–strain curves of metallic substrates with and without a surface film, one can evaluate the residual stress in the film using these formulae. A tarnish film on a brass substrate formed after immersion in Mattsson’s solution was tested to demonstrate these methods, and the obtained residual stress showed a low difference below 6.8%.

► A method to obtain the residual stress in film on metallic substrate is proposed.
► The theoretic analysis formulae of the testing method are proposed.
► Finite element method was conducted to verify the accuracy and reliability.
► Experiment of tarnish film on brass was tested to demonstrate the method.