Effect of temperature on the residual stress of a β-PbO 2 coating

Abstract

In the study of dimensionally stable anodes, the root causes of poor adhesion must be identified because the lead dioxide coating easily falls off. In this paper, the surface morphologies of a series of lead dioxide coatings prepared at different temperatures were observed by scanning electron microscopy, and the residual stresses of the coatings were determined by an X-ray diffraction method. Moreover, electrochemical impedance spectroscopy was used to measure the corrosion resistance of the samples. The analysis demonstrated that the preparation temperature effectively changed the morphology of the β-PbO₂ coating, and the density of grain boundaries and crystal defects in the coating were the main causes of tensile stress, which can accelerate the exfoliation of the coating.