Hydrogen in enameling steel

Enameling steel, used in a vast range of applications, can suffer from a surface defect resembling fish scale. In this study, the effects of several microstructural, physical and coating factors on the hydrogen diffusion in low carbon steel were investigated using an electrochemical permeation apparatus, to find out the way to prevent the surface defects on the enamel coatings.; A new mechanism explaining the formation of the surface defects on the enameling steel was proposed after summarizing the experimental results. Then, the effects of porosity, dislocation density, the surface roughness of a steel substrate, oxide passive layer and Pd coating on the hydrogen diffusion coefficient, hydrogen concentration and hydrogen flux were investigated.; The variations of hydrogen diffusion coefficient, hydrogen concentration in steel and hydrogen flux caused by all factors listed previously were calculated in order to understand the effect of these factors on hydrogen diffusion.