1172Standard Laboratory Procedures 11721 Pretreatment of Test Samples

Corrosion processes occur at the environment-metal interface and therefore quite naturally are dependent upon the state of the surface. Any sample preparation or pretreatment should provide a surface that is representative of that to be encountered in service. Often sample preparation involves wet polishing with emery papers followed by fine polishing to a micron surface finish using diamond paste media. The effect of these and other treatments, that is, cutting, grinding and so on, is one of including residual stresses into the sample surface. Care should therefore be taken during sample preparation not to change the natural characteristics of the surface.

0 0

Post a comment