Li Yuchun, Gong Xunjie, Peng Keru and Luo Yunbo
The conjoint effect of the binary inhibitors molybdate and phosphate on Type A20 carbon steel has been studied, using electrochemical measurement tests. The compatibility between…
Abstract
The conjoint effect of the binary inhibitors molybdate and phosphate on Type A20 carbon steel has been studied, using electrochemical measurement tests. The compatibility between molybdate and phosphate can achieve synergistic benefits, and the inhibitive mechanism was investigated.
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Li Yuchun, Gong Xunjie, Peng Keru and Xie Xunjun
The conjoint effect of the binary inhibitors molybdate and phosphate on Type A20 carbon steel has been studied, using electrochemical measurement tests. The compatibility between…
Abstract
The conjoint effect of the binary inhibitors molybdate and phosphate on Type A20 carbon steel has been studied, using electrochemical measurement tests. The compatibility between molybdate and phosphate can achieve synergistic benefits, and the inhibitive mechanism was investigated.
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Keywords
Xie Xuejun, Yang Wanqin, Cao Shunan, Pan Ling, Gong Xunjie and Peng Keru
To study the corrosion behavior and discuss the corrosion mechanism of No. 20 carbon steel in water in the presence of sulfide ions.
Abstract
Purpose
To study the corrosion behavior and discuss the corrosion mechanism of No. 20 carbon steel in water in the presence of sulfide ions.
Design/methodology/approach
The mass‐loss method, electrochemical tests and surface analysis were used to study the corrosion behavior and discuss the corrosion mechanism of No. 20 carbon steel in water in the presence of sulfide ions.
Findings
General corrosion occurred when No. 20 carbon steel was immersed in both test solutions (concentrated sample with S2− added to 0.8 mg/L, and pure concentrated sample with no S2− added). The presence of S2− in test solutions accelerated the corrosion rate of No. 20 carbon steel.
Practical implications
In order to prevent No. 20 carbon steel in water with S2− from corroding, S2− must be removed.
Originality/value
It was found that the presence of S2− in test solutions accelerated the corrosion rate of No. 20 carbon steel in this paper. Therefore, when water containing sulfide ions is used as the source of make‐up water and cooling water, S2− in water must be removed to prevent the pipelines and facilities from corroding. This means the research results can offer theoretical guidelines for the prevention of pipelines and facilities in the power plant from corroding.
Xie Xuejun, Cao Shunan, Pan Ling, Gong Xunjie and Peng Keru
The inhibition mechanism and the relationship between the inhibition efficiency of para‐chlorobenzene nitriles on carbon steel in hydrochloric acid, and their molecular structure…
Abstract
The inhibition mechanism and the relationship between the inhibition efficiency of para‐chlorobenzene nitriles on carbon steel in hydrochloric acid, and their molecular structure, were studied by microscopy and quantum chemistry calculations. The inhibition of carbon steel was achieved by chemisorption of the para‐chlorobenzene nitriles onto the surface of the carbon steel. The greater was the σN (absolute value) and the less the ELUMO value, the greater was the inhibition efficiency.
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Xuejun Xie, Ling Pang, Shunan Cao, Wanqin Yang, Min Yan, Xunjie Gong and Keru Peng
The purpose of this paper is to present a study of corrosion inhibition of carbon steel in hydrochloric acid by some benzene nitriles using the quantum chemistry calculation.
Abstract
Purpose
The purpose of this paper is to present a study of corrosion inhibition of carbon steel in hydrochloric acid by some benzene nitriles using the quantum chemistry calculation.
Design/methodology/approach
The molecular structure and inhibition mechanism, and the relationship between inhibition efficiency of some benzene nitriles on carbon steel in the hydrochloric acid, were studied from a microcosmic viewpoint using the quantum chemistry calculation.
Findings
The calculation results showed that the inhibition efficiency of benzene nitriles on carbon steel in hydrochloric acid could be expressed by σN and ELUMO, and the greater σN absolute value and the lesser the value of ELUMO, then the greater the efficiency of the inhibitor. The regression equation for benzene nitriles is: η=2.665056−0.4447122ELUMO−10.92817σN r=0.9953128.
Originality/value
The paper offers insights into the application of the quantum chemistry calculation.