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51316-7265-Corrosion Behavior of Cr and Cu Containing Low Alloys Steels in Solution

Four low carbon steels with different Cr and Cu concentrations were prepared to investigate the effect of alloying elements on their corrosion behavior in 3.5% NaCl solution diluted hydrochloric acid and dilute sulphuric acid (pH=1.4-1.5) respectively. Electrochemical measurement and immersion test at room temperature characterized the corrosion behavior and evaluated the corrosion rate.

Product Number: 51316-7265-SG
ISBN: 7265 2016 CP
Author: Qiu Xu
Publication Date: 2016
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Alloying elements affect the corrosion performance. Many researchers have been reported the positive or negative effects of Cr and Cu addition on the corrosion behavior of steels. It is generally considered that Cr and Cu play different roles when the steels exposed to the different solution. The aim of this work is to search for the role of Cr and Cu in steels in different solutions. In this study four kinds of low carbon steel with different Cr and Cu concentrations were prepared in the laboratory in order to investigate the effect of alloying elements on their corrosion behavior in 3.5% NaCl solution diluted hydrochloric acid and dilute sulphuric acid (pH=1.4-1.5) respectively. Electrochemical measurement and immersion test were performed at room temperature to characterize the corrosion behavior and evaluate the corrosion rate. Experimental results indicated that the corrosion resistance increased as a result of Cr and Cu addition in 3.5% NaCl solution while the corrosion resistance decreased as a result of Cr or Cu addition in acidic solution. In acidic solution electrochemical impedance spectroscopy (EIS) revealed a capacitive semicircle in the high frequency range and an inductive loop in the low frequency range the alloy elements of Cr and Cu exhibited a synergistic effect leading to an increase in the corrosion rate of steel.

 

Key words: downloadable, low alloy steel, copper, chromium, acid solution, corrosion product

Alloying elements affect the corrosion performance. Many researchers have been reported the positive or negative effects of Cr and Cu addition on the corrosion behavior of steels. It is generally considered that Cr and Cu play different roles when the steels exposed to the different solution. The aim of this work is to search for the role of Cr and Cu in steels in different solutions. In this study four kinds of low carbon steel with different Cr and Cu concentrations were prepared in the laboratory in order to investigate the effect of alloying elements on their corrosion behavior in 3.5% NaCl solution diluted hydrochloric acid and dilute sulphuric acid (pH=1.4-1.5) respectively. Electrochemical measurement and immersion test were performed at room temperature to characterize the corrosion behavior and evaluate the corrosion rate. Experimental results indicated that the corrosion resistance increased as a result of Cr and Cu addition in 3.5% NaCl solution while the corrosion resistance decreased as a result of Cr or Cu addition in acidic solution. In acidic solution electrochemical impedance spectroscopy (EIS) revealed a capacitive semicircle in the high frequency range and an inductive loop in the low frequency range the alloy elements of Cr and Cu exhibited a synergistic effect leading to an increase in the corrosion rate of steel.

 

Key words: downloadable, low alloy steel, copper, chromium, acid solution, corrosion product

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