Corrosion rate and corrosion product characterisation using Raman spectroscopy for steel embedded in chloride polluted fly ash mortar

被引：30

作者：

Criado, M. ^{[1
]}

Martinez-Ramirez, S. ^{[2
]}

Fajardo, S. ^{[3
]}

Gomez, P. P. ^{[3
]}

Bastidas, J. M. ^{[3
]}

机构：

[1] CSIC, Inst Ciencia Mat Madrid, Canto Blanco 28049, Spain

[2] CSIC, Inst Estruct Mat, E-28006 Madrid, Spain

[3] CSIC, Ctr Nacl Invest Met, E-28040 Madrid, Spain

来源：

MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION | 2013年 / 64卷 / 05期

关键词：

chloride; corrosion; electrochemical techniques; fly ash; Raman spectroscopy; ACTIVATED SLAG CONCRETE; NICKEL STAINLESS-STEEL; CARBONATED CONCRETE; REINFORCING STEEL; PORE SOLUTIONS; BEHAVIOR; IRON; RESISTANCE; CEMENT; REINFORCEMENTS;

D O I：

10.1002/maco.201206714

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Electrochemical impedance spectroscopy (EIS) and polarisation curves assisted by Raman spectroscopy were used to study the corrosion behaviour and to characterise the corrosion products of reinforcing steel embedded in fly ash mortars with and without chloride pollution. Two alkaline solutions with different soluble silica contents were utilised to activate the fly ash. After 720 days of experimentation the reinforcing steel embedded in fly ash mortar without chlorides remained passive, while the specimens in fly ash polluted with chloride ions (0.4 and 2%) yielded current density values of the order of 2x105A/cm2, typical of an active state. The main corrosion products identified on the steel surface were less crystallised phases of iron oxyhydroxide hydrates and goethite (-FeOOH) or lepidocrocite (-FeOOH).

引用

页码：372 / 380

页数：9

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