Analysis on the under deposit corrosion of air cooler tubes: Thermodynamic, numerical and experimental study

Zheng, Zhijian; Ou, Guofu; Ye, Haojie; Tan, Jieqing; Jin, Haozhe

doi:10.1016/j.engfailanal.2017.05.018

Cited by 24 publications

(4 citation statements)

References 6 publications

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“…Tan et al [2] used the wire beam electrode technology to study the corrosion and its inhibition effect under sand sediments and further confirmed that local corrosion of metals occurred at the structural position, and the imidazoline and oxygen were the key factors influencing the corrosion morphology. Zheng et al [3] studied the failure of air cooler tubes caused by the NH4Cl deposit, and the results showed that the 316L steel performed better in anti-corrosion.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical study on under-deposit corrosion evolution of oil pipelines

Yang

2024

J. Phys.: Conf. Ser.

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In the development of oil and gas fields, due to the sand, calcium, and magnesium ions in the produced liquid, the under-deposit corrosion formed by deposition during the transportation process has become one of the key factors of pipeline failure. Therefore, aiming at the problem of CaCO3 under-deposit corrosion in CO2-flooded oil pipelines, this paper studied the influence of deposit thickness change on metal corrosion based on electrochemical experiments, image characterization, and corrosion product analysis. The results showed that the corrosion process of the deposit layer can be divided into three stages. (1) The deposit layer promoted the movement of the electrolyte and then enhanced the corrosion rate of the matrix, leading to the increase of the size and maximum pit depth of the matrix, which was manifested as a rapid negative shift of the open circuit potential. (2) The deposit layer played a certain physical shielding role, leading to the size and maximum pit depth of the pit decreasing, and the number of pits increasing, at which the open circuit potential basically remained unchanged. (3) The deposit layer can play an effective physical shielding role, and the oxygen concentration corrosion inside and outside the deposit layer made the number of pits increase sharply, which was manifested as a slow negative shift of open circuit potential. The deposit layer mainly affected the cathode reaction process of the corrosion process. With the increase of the deposit thickness, the metal corrosion intensified with an increasing corrosion current density.

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Section: Introductionmentioning

confidence: 99%

Electrochemical study on under-deposit corrosion evolution of oil pipelines

Yang

2024

J. Phys.: Conf. Ser.

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“…Moreover, ammonia regarded as the corrosion inhibitor is injected into the upstream pipes in front of the cooling equipment during the refining process to slow down the corrosion rate and reduce the perforation risks of the pipeline. [ 16,17 ] Our previous research showed that ammonia could increase the pH and delay the breakdown potential of CS through potentiodynamic polarization experiments. [ 18 ] The adsorption of ammonia at the active site inhibits the electro dissolution of the steel, resulting in the open circuit potential (OCP) shifting to the positive direction and diminishing the tendency for corrosion to occur.…”

Section: Introductionmentioning

confidence: 99%

Effect of chloride threshold on pitting behavior of 316LN stainless steel in sour water solution by electrochemical analysis

Chen

Sun

2022

Materials & Corrosion

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The effect of chloride threshold (CT = [Cl − ]/[SO 4 2−]) on the pitting behaviors of 316LN in the sour water was studied by using electrochemical tests. The result shows that the pitting resistance of 316LN decreases with the increase in CT and temperature. The critical chloride threshold (CCT) decreases from 3 at 40°C to 1.5 at 70°C and then remains unchanged when further increases the temperature. The EIS experiment manifests that the protectiveness of the passive film reduces with the increase of CT, and the variation of the charge transfer resistance (R ct ) is in keeping with the pitting potential (E pit ). Increasing the CT or raising the temperature from 40°C to 80°C enhances the donor (point defect) density, resulting in a thinning of the protective film. Methods to raise the value of the CCT, that is, to improve the chlorine corrosion resistance of the pipelines were proposed.

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“…Experimental evidence indicated that the leaking was caused by under deposit corrosion. Zheng et al (2017) determined the corrosion mechanism by the analysis on the micro-morphology and chemical composition of corrosion products, which was due to failure of air cooler tubes caused by under deposit corrosion of NH 4 Cl salts. Sreevidya et al (2020) found intergranular stress corrosion cracking in an AISI 304 stainless steel tube, which leads to leaks of the pipe.…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of a commercially pure titanium tube in an air conditioner condenser

Yang

Liu

et al. 2021

ACMM

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Purpose The purpose of this paper is to determine the failure reasons and failure mechanism of the commercially pure titanium air conditioning condenser. Design/methodology/approach In this paper, chemical analysis, metallographic observation, visual examination and scanning electron microscope examination, corrosion products analysis and working conditions analysis were adopted for determining the reasons for the failure of the condenser. Findings The results indicated that TA2 titanium pipe perforation failure is caused by the synergistic effect of crevice corrosion and deposit corrosion. The corrosion processes can be divided into three steps. Originality/value This research is an originality study on the failure case of a commercially pure titanium air conditioning condenser. This study makes up for the shortage of titanium alloy failure cases and also gives the result of the failure reason and failure mechanism for titanium, which has an engineering significance.

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Analysis on the under deposit corrosion of air cooler tubes: Thermodynamic, numerical and experimental study

Cited by 24 publications

References 6 publications

Electrochemical study on under-deposit corrosion evolution of oil pipelines

Electrochemical study on under-deposit corrosion evolution of oil pipelines

Effect of chloride threshold on pitting behavior of 316LN stainless steel in sour water solution by electrochemical analysis

Failure analysis of a commercially pure titanium tube in an air conditioner condenser

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