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海水盐度、pH值和温度对海洋油气管道外部腐蚀行为及显微硬度的影响：响应曲面法建模与优化

Effect of seawater salinity, pH, and temperature on external corrosion behavior and microhardness of offshore oil and gas pipeline: RSM modelling and optimization.

作者信息

Chohan Imran Mir, Ahmad Azlan, Sallih Nabihah, Bheel Naraindas, Salilew Waleligne Molla, Almaliki Abdulrazak H

机构信息

Department of Mechanical Engineering, Universiti Teknologi PETRONAS, Tronoh, Bandar, 32610, Seri Iskandar, Perak, Malaysia.

Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS, Tronoh, Bandar, 32610, Seri Iskandar, Perak, Malaysia.

出版信息

Sci Rep. 2024 Jul 17;14(1):16543. doi: 10.1038/s41598-024-67463-2.

DOI:10.1038/s41598-024-67463-2
PMID:39019941
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11255295/
Abstract

This research aims to investigate the effects of seawater parameters like salinity, pH, and temperature on the external corrosion behaviour and microhardness of offshore oil and gas carbon steel pipes. The immersion tests were performed for 28 days following ASTM G-1 standards, simulating controlled artificial marine environments with varying pH levels, salinities, and temperatures. Besides, Field emission scanning electron microscopy (FESEM) analysis is performed to study the corrosion morphology. Additionally, a Vickers microhardness tester was used for microhardness analysis. The results revealed that an increase in salinity from 33.18 to 61.10 ppt can reduce the corrosion rate by 28%. In contrast, variations in seawater pH have a significant effect on corrosion rate, with a pH decrease from 8.50 to 7 causing a 42.54% increase in corrosion rate. However, the temperature of seawater was found to be the most prominent parameter, resulting in a 76.13% increase in corrosion rate and a 10.99% reduction in the microhardness of offshore pipelines. Moreover, the response surface methodology (RSM) modelling is used to determine the optimal seawater parameters for carbon steel pipes. Furthermore, the desirability factor for these parameters was 0.999, and the experimental validation displays a good agreement with predicted model values, with around 4.65% error for corrosion rate and 1.36% error for microhardness.

摘要

本研究旨在探究盐度、pH值和温度等海水参数对海洋油气碳钢管道外部腐蚀行为及显微硬度的影响。按照ASTM G - 1标准进行了为期28天的浸泡试验，模拟了不同pH值、盐度和温度的受控人工海洋环境。此外，采用场发射扫描电子显微镜（FESEM）分析来研究腐蚀形态。另外，使用维氏显微硬度测试仪进行显微硬度分析。结果表明，盐度从33.18 ppt增加到61.10 ppt可使腐蚀速率降低28%。相比之下，海水pH值的变化对腐蚀速率有显著影响，pH值从8.50降至7会使腐蚀速率增加42.54%。然而，发现海水温度是最显著的参数，导致海洋管道的腐蚀速率增加76.13%，显微硬度降低10.99%。此外，采用响应面方法（RSM）建模来确定碳钢管道的最佳海水参数。此外，这些参数的可取性因子为0.999，实验验证与预测模型值显示出良好的一致性，腐蚀速率误差约为4.65%，显微硬度误差为1.36%。

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