P110SS 在海底超高温超临界 CO2 中的腐蚀规律研究
作者
朱新宇黄熠李文拓高禹傅琦于延钊
单位
1.中国石油大学(北京) 2 油气装备材料失效与腐蚀防护北京市重点实验室 3.中海石油(中国)有限公司海南分公司 4.海南省深海深层能源工程重点实验室
关键词
超高温超临界 CO2低合金钢腐蚀试验 23Innovation Express Seminar Lignin self-healing coatings based on thermo-reversible Diels-Alder reaction for anticorrosion applications Jinsong Wang1Farzad Seidi1*Huining Xiao2* 1Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources and International Innovation Center for Forest Chemicals and MaterialsNanjing Forestry UniversityNanjing 210037China 2Department of Chemical EngineeringUniversity of New BrunswickFrederictonNew BrunswickE3B 5A3 Canada f_seidi@njfu.edu.cnhxiao@unb.ca Abstract As is widely recogniz edmetal corrosion presents a significant challenge worldwidecausing extensive economic loss. Coating is widely utilized as an effective and direct approach for metal corrosion preventionwith organic and polymer coatings being the most commonly applie d strategy. The traditional synthesis method for organic polymer coatings is complexand the raw materials primarily originate from petroleum-based sourcesaggravating the energy crisis. Furthermorethese raw materials contain volatile organic compounds (VOCs)posing a hazard to human health. Additionallyonce the coating experiences external forcesmicrocracks can emergethereby leading to a loss of its protective ability. Hencein line with the strategic objectives of promoting environmental frien dliness and sustainable developmentbio-based materials like lignin have gradually replaced petroleum-based materials as a frontier in polymer science research. In this regardresearchers are focusing on combining bio -based materials with self -healing te chnology for metal corrosion prevention. In the current researchwe explored the fabrication of thermo - reversible polymer networks made of bio-based materials to address the growing need for greener and more sustainable polymer coating. Hereinwe develop ed thermally self-healing lignin -based coatings with strong anticorrosion performances through Diels-Alder crosslinking strategy. Accordinglyorganosolv lignin was first functionalized by furan moieties and then used for thermally crosslinking by 44' - bismaleimidodiphenylmethane (BMI) after spin casting on the surface of steel sheets. Under the optimum conditionsthe obtained coating could generate smooth and defect free layers. A thin layer (18 μ m) of this coating could increase the Ecorr from -481 mV (for bare steel) to +142 mV and reduced the corrosion rate (CR) over 3300 times. Importantlythe thermo-reversibility of the network endows excellent self-healing ability to the coating. Indeedlignin self -healing coatings based on thermo -reversible Diels-Alder reaction provides a creative strategy for bio -based materials applied in anticorrosion applications with high-performance. Fig. 1 Schematic method for functionalization of lignin with furan groups and then fabrication of lignin-based self-healing coatings through Diels-Alder cross-linking reaction. Keywords: LigninCorrosionDiels-AlderSelf-healing
收录来源
International Corrosion Congress · 第22届国际腐蚀大会
摘要
随着海上油气勘探开发逐 渐向深层发展,油井管服役环境俞趋严峻,材料在超 高温高压环境下面临严重的腐蚀失效风险。目的:为明晰在过饱和超临界 CO2 下低合 金钢油井管的腐蚀行为和规律,以 P110SS 为研究对象,通过静态腐蚀失重实验,分 析了宽域温度 (40°C~250°C)和超高压力 (4MPa~70MPa)对超临界状态下材料腐蚀速率 规律的影响。利用 SEM、EDS 等分析方法,对腐蚀产物的形态及成分等特征进行表征。 结果:P110SS 在模拟海洋工况 10MPa CO 2 分压下,在 80°C下腐蚀速率最高,为 2.43mm/a,随温度升高腐蚀速率不断降低,250°C下腐蚀速率为 0.17mm/a。在压力低 于 7.35 MPa 时,随压力增加腐蚀速率呈线性增加。当 CO2 脱离密相态,压力对腐蚀速 率的影响不再显著。结论:无论 CO2 处于密相态或超临界态,温度对 P110SS 的腐蚀 速率影响规律均呈现先升高后降低的趋势,腐蚀模式未发生改变。腐蚀速率在 80°C时 最高,随温度升高逐渐降低,180°C以上基本保持平稳,腐蚀速率受腐蚀产物的致密度 控制。随 CO2 压力增加,腐蚀速率逐渐升高, P110SS 腐蚀速率对处于密相态下的 CO2 压力更为敏感,变化趋势与 CO2 在水中的溶解度有关。本研究为理解材料在超临 界 CO2 状态下的腐蚀行为和机理提供了有益补充。