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铁配合型镁合金缓蚀剂的阴极阻蚀机制

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研究阴极缓蚀剂(3-甲基水杨酸盐,3-MeSA)对含铁纯镁腐蚀性能的影响.高铁杂质颗粒成分、腐蚀表面形貌以及3-MeSA分子结构特征为揭示含铁镁合金的腐蚀行为及3-MeSA的阴极型阻蚀机理提供了实验与理论依据.研究结果表明:含铁杂质颗粒中含有固溶态硅,而Fe/Si比可能是导致不同局部腐蚀形态差异的主要原因.虽然3-MeSA能在镁基体上形成吸附层,但其阻蚀机制主要归因于其螯合从富铁颗粒中自腐蚀释放Fe2+/Fe3+的能力,阻止被还原的铁物质再次沉积至腐蚀金属表面.
Cathodic inhibition mechanism of magnesium alloys by using iron-complex inhibitor
The effect of a cathodic inhibitor(3-methylsalicylate,3-MeSA)on the corrosion properties of Fe-contained pure Mg was investigated.The composition of Fe-rich particles,corrosion surface morphology,and molecular structure of 3-MeSA provide experimental and theoretical evidence for the corrosion behavior of Fe-contained Mg alloy and the corresponding cathodic inhibition mechanism of 3-MeSA.The results showed that silicon in a solid solution within Fe-rich particles was found,and the features of corrosion spots may correlate with different Fe/Si ratios.Although 3-MeSA can form an adsorptive layer on Mg substrate,its inhibition mechanism can be mainly ascribed to the capability to chelate Fe2+/Fe3+ions released from self-corrosion of Fe-rich particles,preventing the re-deposition of the reduced Fe species.

magnesiumiron-rich impurityiron complexcathodic inhibitorquantum chemical calculation

杨俊杰、王霖倩、Carsten BLAWERT、Sviatlana V.LAMAKA、Christian FEILER、Mikhail L.ZHELUDKEVICH、李卫

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暨南大学先进耐磨蚀及功能材料研究院,广州 510632

暨南大学韶关研究院,韶关 512027

Institute of Surface Science,Helmholtz-Zentrum Hereon(Hereon),21502 Geesthacht,Germany

Faculty of Engineering,University of Kiel,Kaiserstraße 2,24143 Kiel,Germany

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镁 富铁杂质 铁配合剂 阴极型缓蚀剂 量子化学计算

国家自然科学基金Guangdong Basic and Applied Basic Research FoundationGuangdong Basic and Applied Basic Research FoundationGuangzhou Basic and Applied Basic Research Foundation,China

521010842023A15150115792020A1515110754202102020612

2024

10.1016/S1003-6326(24)66486-1

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(5)