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一、钢筋的电化学腐蚀机理混凝土空隙中的水分,通常是以饱和氢氧化钙溶液的形式存在,其中还含有一些氢氧化钠和氢氧化钾,pH值约为12.5.在这样的强碱性环境中,钢筋表面形成一种钝态膜层,它是厚度为20～60?的水化氧化物(Y—Fe_2O_3·nH_2O),正是这种很薄的氧化膜层,使钢筋受到保护,不致腐蚀.因此,对于那些施工质量较好,没有裂缝的钢筋混凝土结构物,即使置放在
1. Electrochemical Corrosion Mechanism of Reinforcing Bars Moisture in concrete voids is usually in the form of saturated calcium hydroxide solution, which also contains some sodium hydroxide and potassium hydroxide, with a pH of about 12.5. In the environment, a passive film layer is formed on the surface of the steel bar. It is a hydration oxide (Y-Fe 2 O 3 ·nH 2 O) with a thickness of 20 to 60 Å. It is this very thin oxide film that protects the steel bar. No corrosion, therefore, for those reinforced concrete structures with good construction quality and no cracks, even if placed