Abstract
A comprehensive analysis of the erosion–corrosion behavior of AISI 304L stainless steel immersed in 0.5 M NaCl solution with the addition of industrial tailing particles obtained from the copper mining industry is reported. From fundamental studies using combined measurements of potentiodynamic and weight loss techniques, the pure corrosion, pure erosion, and their synergism on the total wear rate were evaluated. The results showed that the presence of soluble chemical reagents dragged by tailing particles significantly affects the pure corrosion rate in comparison with a NaCl solution without these chemical reagents. In addition, the wear of stainless steel by pure erosion was found to be more important than that of pure corrosion. Erosion–corrosion tests performed under an open circuit potential behavior indicate lower and higher wear values than that obtained for erosion and corrosion rates, respectively. Through these results, it was possible to determine an antagonistic effect for AISI 304L stainless steel in industrial tailings slurries. These results are supported by changes in the electrochemical parameters, passive film stability, and morphological attributes.
Highlights
The austenitic stainless steel is the most widely used alloy in multiple industrial applications such as architecture, mining, chemistry, metallurgy, and marine equipment and infrastructure
The corrosion rate and passive film breakdown have been extensively studied in austenitic stainless steel [5,8,9,10,11,12], covering situations when this material is subjected to mechanical damage from solid particles [13,14,15,16,17,18,19], which is described as an erosion–corrosion phenomenon [20]
We studied the wear of stainless steel AISI 304L under three different mechanisms mechanisms of pure pure corrosion, corrosion, pure pure erosion, erosion, and and erosion–corrosion erosion–corrosion using industrial tailings from the the copper copper mining industry as erodent
Summary
The austenitic stainless steel is the most widely used alloy in multiple industrial applications such as architecture, mining, chemistry, metallurgy, and marine equipment and infrastructure. The presence of chromium and nickel in these steels improves considerably its corrosion resistance, as a result of the spontaneously formed passive film on its surface [1,2,3]. This passive film can be strongly destabilized originating its failure or breakdown that initiates a localized corrosion process such as pitting corrosion [4,5,6,7]. The corrosion rate and passive film breakdown have been extensively studied in austenitic stainless steel [5,8,9,10,11,12], covering situations when this material is subjected to mechanical damage from solid particles [13,14,15,16,17,18,19], which is described as an erosion–corrosion phenomenon [20]
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