Identification of chemical compounds under the surface film during a surface treatment process using laser Raman spectroscopy

Abstract

Laser Raman Spectroscopy was employed to analyse the surfaces of rusted 9Cr-1Mo (modified) steel specimens that were pickled, pickled and passivated for different durations in a specific process optimization study. It wasobserved that the surface oxide scales were completely removed by the surface treatment of acid pickling for 600 s. The study demonstrated the ability of the technique as a potential monitoring tool in surface chemical processing of metallic components for both laboratory studies and in-service application.