Li Jiang, Xuhui Mao, Jianfei Yu and Fuxing Gan
The purpose of this paper is to study corrosion behavior and corrosion mechanism of carbon steel in natural freshwaters with humic acid (HA).
Abstract
Purpose
The purpose of this paper is to study corrosion behavior and corrosion mechanism of carbon steel in natural freshwaters with humic acid (HA).
Design/methodology/approach
The weight‐loss method, electrochemical measurements and surface analysis technique were used to study the corrosion behavior of carbon steel in freshwaters with HA.
Findings
General corrosion occurred when carbon steel was exposed to test solutions (fresh lake water with and without HA). The presence of HA in test solution can accelerated the corrosion rate of carbon steel.
Originality/value
There have been few reports on the effect of HA on the corrosion behavior of carbon steel. In this study, it is clearly shown that the presence of HA in fresh lake water can accelerate the corrosion rate of carbon steel. This research not only can offer theoretical guidelines for the prevention of pipelines and facilities from corroding, but also can provide a reference for suitable material selection and the further protection of carbon steel in hydraulic engineering.
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Keywords
Jianfei Yu, Li Jiang and Fuxing Gan
This paper aims to study the corrosion behavior of carbon steel and stainless steel in white oil with naphthenic acid under high temperature.
Abstract
Purpose
This paper aims to study the corrosion behavior of carbon steel and stainless steel in white oil with naphthenic acid under high temperature.
Design/methodology/approach
The weight‐loss method and surface analysis were used to study the corrosion behavior of steel in white oil with naphthenic acid.
Findings
Naphthenic acids corrosion rates were directly related to experimental temperature, immersion time and total acid number (TAN). The activation energy was calculated and the process kinetics could be represented by Arrhenius‐type equation. The relationship between the isothermal line in liquid phase and that in vapor phase at different TAN values had a significant distinction with the change of temperature.
Originality/value
The findings have important implications for assessing the corrosivity of crude oils with high TAN value from various resources.
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An Lin, Xian Zhang, Dajing Fang, Miao Yang and Fuxing Gan
The purpose of this paper is to study the corrosion resistance and the insulating characteristics of an environment‐friendly chromium‐free coating on electrical steel.
Abstract
Purpose
The purpose of this paper is to study the corrosion resistance and the insulating characteristics of an environment‐friendly chromium‐free coating on electrical steel.
Design/methodology/approach
A water‐based semi‐inorganic environment‐friendly insulating coating on electrical steel was developed. The coating system of silane coupling agent and rare earth salt were used first in this coating to replace the chromate containing coating. In this study, it provided a successful combination of coating and passivation.
Findings
Several test results, such as insulating ability, corrosion resistance, adhesion strength and hardness, showed that the performance of the film complied fully with the industry standards, particularly excellent in its corrosion resistance and the maximum corrosion resistance (neutral salt‐spray test) time up to 20 h.
Originality/value
There have been few reports on the chromium‐free insulating coating on electrical steel, and described in the paper, this environment‐friendly insulating coating on electrical steel was found to be highly effective.
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Li Jiang, Xuhui Mao, Jianfei Yu, An Lin and Fuxing Gan
The aim of this paper is to study the corrosion behavior and corrosion mechanism of carbon steel in polluted freshwaters with organophosphorus pesticide (OP).
Abstract
Purpose
The aim of this paper is to study the corrosion behavior and corrosion mechanism of carbon steel in polluted freshwaters with organophosphorus pesticide (OP).
Design/methodology/approach
The weight‐loss method, electrochemical measurements and surface analysis technique were used to study the corrosion of carbon steel in polluted freshwaters with OP.
Findings
General corrosion occurred when carbon steels were exposed to test solutions (freshwaters with and without OP). The presence of OP in test solutions can accelerate the corrosion rate of carbon steel.
Originality/value
The aim of this work was to evaluate the effect of a single OP (diethyl phosphite) on the corrosion of carbon steel. Until now, there was little research to report on this aspect. It was found that the presence of diethyl phosphite at low concentrations could accelerate the corrosion rate of carbon steel in freshwaters. This research not only can offer theoretical guidelines for the prevention of pipelines and facilities from corroding, but also can provide reference for suitable material selection.