PDF(Pubmed)
Abstract：
Naphthenic acid corrosion is a well-recognized factor contributing to corrosion in the construction of offshore industry pipelines. To mitigate the corrosive effects, minor quantities of alloying elements are introduced into the steel. This research specifically explores the corrosion effects arising from immersing low-carbon steel, specifically A333 Grade 6, in a naphthenic acid solution. Various weight percentages of niobium were incorporated, and the resulting properties were observed. It was noted that the addition of 2% niobium in low-carbon steel exhibited the least mass loss and a lower corrosion rate after a 12 h immersion in naphthenic acid. Microstructural analysis using scanning electron microscopy (SEM) revealed small white particles, indicating the presence of oil sediment residue, along with corrosion pits. Following the addition of 2% niobium, the occurrence of corrosion pits markedly decreased, and only minor voids were observed. Additionally, the chemical composition analysis using energy-dispersive X-Ray analysis (EDX) showed that the black spot exhibited the highest percentage of carbon, resembling high corrosion attack. Meanwhile, the whitish regions with low carbon content indicated the lowest corrosion attack. The results demonstrated that the addition of 2% niobium yielded optimal properties for justifying corrosion effects. Therefore, low-carbon steel with a 2% niobium addition can be regarded as a superior corrosion-resistant material for offshore platform pipeline applications.
摘要：
环烷酸腐蚀是导致海上工业管道建设中腐蚀的公认因素。为了减轻腐蚀作用，少量的合金元素被引入钢中。这项研究专门探讨了浸泡低碳钢产生的腐蚀效应，特别是A3336级，在环烷酸溶液中。加入各种重量百分比的铌，并观察所得的性质。注意到，在低碳钢中添加2％铌在环烷酸中浸入12小时后表现出最小的质量损失和较低的腐蚀速率。使用扫描电子显微镜（SEM）的微观结构分析显示小的白色颗粒，表明存在油沉淀物残留物，随着腐蚀坑。添加2%铌后，腐蚀坑的出现明显减少，只观察到微小的空隙。此外,使用能量色散X射线分析（EDX）的化学成分分析表明，黑点表现出最高的碳百分比，类似于高腐蚀攻击。同时,碳含量低的发白区域表示腐蚀攻击最低。结果表明，添加2％铌可产生最佳性能，以证明腐蚀效果。因此,添加2％铌的低碳钢可被视为海上平台管道应用的优良耐腐蚀材料。
