Engelberg, D.L.

Oernek, C.

The effect of cold deformation on the corrosion behaviour of duplex stainless steel is not fully understood. The work reported in this paper addresses the effect of cold-roll reductions of up to 40% on microstructure development and corrosion behaviour of grade 2205 duplex stainless steel. The deformation heterogeneity and microstructure after cold-rolling as a function of process direction has been analysed by electron backscatter diffraction (EBSD). These microstructure sites were then investigated using Kelvin Probe Force Microscopy (KPFM) and subsequently targeted with MgCl2 salt-laden deposits to probe their corrosion performance in controlled atmospheric environment. In the as-received microstructure the ferrite was preferentially attacked, whilst the austenite became more susceptible to localised corrosion with increasing cold deformation. Interestingly, Volta potential differences measured between a Pt-probe and the surface also changed with the degree of cold deformation. Volta potential hot-spots obtained by KPFM seemed to correlate with regions containing plastic strain

Kelvin Probe Force Microscopy and Atmospheric Corrosion of Cold-rolled Grade 2205 Duplex Stainless Steel

Abstract

Similar works

Full text

Available Versions

The University of Manchester - Institutional Repository