氯离子对碳钢在混凝土孔隙液中腐蚀行为的影响

The Effect of Chlorine Ions on Corrosion of Carbonize Steel in Simulated Concrete Pore Solutions

采用重量法、线性伏安扫描法、弱极化法和SEM,研究C l-对碳钢在模拟混凝土孔隙液(饱和Ca(OH)2溶液)中的腐蚀行为的影响.结果表明,高pH值的混凝土孔隙液能减缓氯离子对碳钢的腐蚀;当pH≥13.6时,在NaC l浓度小于3%的混凝土孔隙液中,碳钢表面因生成钝化膜而不被腐蚀;当pH≤9时,混凝土孔隙液中无论是否存在C l-,碳钢均会被腐蚀;当pH=12.5时,混凝土孔隙液中NaC l浓度小于0.05%,碳钢则不被腐蚀;当混凝土孔隙液中的C l-浓度达到临界氯离子浓度时,碳钢表面的钝化膜开始损坏而被腐蚀,碳钢的腐蚀速度随着C l-浓度的增加而增大.

The effect of Cl^- on corrosion behavior carbonized steel in simulated concrete pore solution （saturation solution of the CaOH） is studied by the weight method and the linear sweep voltammetry method and the weak polarized method and SEM. The result indicates that the high pH concrete pore solution can reduce corrosion of Cl^- on the carbonize steel. When pH ≥ 13.6, the carbonize steel is not corrupted owing to passivate in concrete pore solution of the ω（ NaC1 ） 〈 3%. When pH ≤9, the carbonized steel is corrupted in concrete pore solution with or without Cl^-. When pH = 12.5, the carbonized steel do not corrupt in the concrete pore solution of the ω（NaCl） 〈0.05%. When the concrete pore solution reaches critical Cl^- concentration, the passivated film on carbonized steel begins dissolved. The greader Cl^- concentration is, the rapider the corrosion rate of the carbonized steel is.