Influence of Sulfide on Anti-Corrosion Performance of Passive Film Formed on Stainless Steel in Borate Buffer Solution

Abstract

The semiconducting behavior of passive film formed on 316L stainless steel in borate buffer solution containing sulfide was studied by capacitance measurements. The results indicate p-type semiconducting behavior related to chromium oxide of the passive film at -1.12 ~ -0.78V and n-type semiconducting behavior to iron oxide at -0.47 ~ +0.35V, with an acceptor density 11.21020 cm-3 and a donor density 7.501020 cm-3 respectively. The existence of sulfide in the solution obviously increases the acceptor densities which reaches to 215.61020 cm-3 with the sulfide concentration of 12 mgL1, and therefore have a more conductive behavior.

Influence of Homogenization and Annealing Temperatures on the Microstructure, Mechanical Properties, and Passive Properties of Cold Rolled 2205 Duplex Stainless Steel

“…The electrochemical measurements were initiated after 60 min at the open circuit potential (OCP) stabilization at 25 °C. To ensure good reproducibility, a minimum of three sets of measurements for each sample was taken and an average value was considered in pH 9 borate buffer solution (0.05 M H 3 BO 3 e 0.075 M Na 2 B 4 O 7 •10H 2 O), which was extensively used to investigate the passivity of stainless steels in previous works [27][28][29][30][31][32] .…”