Influence of Humic Substances on the Corrosion of the API 5LX65 Steel

L.F.P. Dick; L.M. Rodrigues

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Influence of Humic Substances on the Corrosion of the API 5LX65 Steel

机译：Influence of Humic Substances on the Corrosion of the API 5LX65 Steel

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Aiming to simulate the underground corrosion of pipeline steels in tropic soils, the electrochemical behavior and corrosion morphology of the API 5LX65 steel in 0.01 mol/L sodium sulfate (Na_2SO_4) solutions were studied, with additions of humic (HA) orfulvic (FA) acids, extracted from a peat soil. The corrosion tests showed that FA additions improve the passivity of the steel, whereas HA has the opposite effect. The nucleation of pits is always associated with the presence of rounded complex inclusions, containing sulfides and oxides. Raman spectra of the corrosion products covering the pits and inclusions suggest the formation of organic Fe compounds. The influence of humic substances (HS) on pit nucleation was attributed to a passivity breakdown on the interface between Fe and inclusions, through the formation of partially soluble compounds of Fe and HS.

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来源
《Corrosion: The Journal of Science and Engineering》 |2006年第1期|35-43|共9页
作者
L.F.P. Dick; L.M. Rodrigues;
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作者单位

Federal University of Rio Grande do Sul-UFRGS, Metallurgy Department, Av. Bento Goncalves, 9500, 91501-970, Porto Alegre-RS, Brazil;

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原文格式 PDF
正文语种英语
中图分类金属腐蚀与保护、金属表面处理;
关键词
API 5LX65; humic substances; pipeline steels; underground corrosion;

Influence of Humic Substances on the Corrosion of the API 5LX65 Steel

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