Localized Corrosion and Phase Transformation of Simulated Archaeological Iron

摘要/Abstract

摘要： The corrosion behaviors of simulated archaeological iron in solution(0.06 mol·L^-1 NaCl+0.03 mol·L^-1 Na₂SO₄+0.01 mol·L^-1 NaHCO₃)simulating soil water composition was investigated by potentialdynamic polariza-tion,constant potential polarization,and simulated occluded cell(O.C.)galvanostatic tests.X-ray diffraction(XRD), energy dispersive spectrometry(EDS),and scanning electron microscope(SEM)were used to study the corrosion morphology and the evolution of corrosion product.The objective was to discover the transformation process of archaeological iron,and determine the distribution of chlorinated corrosion products.The results showed that the presence of crevice,cavities,and channels facilitates the localized corrosion under rusts;the autocatalytic effect in-creases the concentration of Fe²⁺,Cl^-,and SO₄^2-,and promotes local acidification within the crevices and cavities. Meanwhile,the phase transformation of corrosion products is concluded to proceed by means of two ways.One is that the ferrous ions are transformed into different kinds of FeOOH via the intermediate Fe(II)-Fe(III)hydroxyl-salt (i.e.Green Rusts);the other is that the Fe²⁺ ions are transformed into FeCl₂,FeCl₃,and orange powders akaganeite at the crevices and cavities.

关键词: corrosion, corrosion product, iron, chlorine

Abstract: The corrosion behaviors of simulated archaeological iron in solution(0.06 mol·L^-1 NaCl+0.03 mol·L^-1 Na₂SO₄+0.01 mol·L^-1 NaHCO₃)simulating soil water composition was investigated by potentialdynamic polariza-tion,constant potential polarization,and simulated occluded cell(O.C.)galvanostatic tests.X-ray diffraction(XRD), energy dispersive spectrometry(EDS),and scanning electron microscope(SEM)were used to study the corrosion morphology and the evolution of corrosion product.The objective was to discover the transformation process of archaeological iron,and determine the distribution of chlorinated corrosion products.The results showed that the presence of crevice,cavities,and channels facilitates the localized corrosion under rusts;the autocatalytic effect in-creases the concentration of Fe²⁺,Cl^-,and SO₄^2-,and promotes local acidification within the crevices and cavities. Meanwhile,the phase transformation of corrosion products is concluded to proceed by means of two ways.One is that the ferrous ions are transformed into different kinds of FeOOH via the intermediate Fe(II)-Fe(III)hydroxyl-salt (i.e.Green Rusts);the other is that the Fe²⁺ ions are transformed into FeCl₂,FeCl₃,and orange powders akaganeite at the crevices and cavities.

Key words: corrosion, corrosion product, iron, chlorine

王紫色, 许淳淳, 董希青. Localized Corrosion and Phase Transformation of Simulated Archaeological Iron[J]. , 2008, 16(2): 299-305.

WANG Zise, XU Chunchun, DONG Xiqing. Localized Corrosion and Phase Transformation of Simulated Archaeological Iron[J]. , 2008, 16(2): 299-305.

参考文献

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