Resumo

SADABA, M.; MARTINEZ, G.  e  SANCHEZ, M.. Use of Stainless Steel as a Reinforced Material in Concrete Structures. Port. Electrochim. Acta [online]. 2005, vol.23, n.1, pp.55-75. ISSN 0872-1904.

For stainless steel 316 evaluation, reinforced concrete samples (12x12x25 cm), using four carbon steel bars and/or 316 stainless steel and two graphite reference electrodes were carried out. The concrete has resistance of 00 Kg/cm² and a water/cement ratio of 0.65. The samples were exposed to an artificial environment of 5% of saline concentration and carbon dioxide, evaluating periodically the state of the samples in each environment. Electrochemical evaluations, such as potential measurement vs. Cu/CuSO₄ electrode and polarization resistance were carried out. In addition, the cyclical polarization of stainless steel samples in pore solution (pH = 13.40) with different chloride concentration (0%, 0.5% and 5% chloride concentration) were evaluated. Stainless steel exposed for 6477 hours in saline environments showed very low corrosion rate for stainless steel, while carbon steel showed corrosion rate from moderate to high. Galvanic couples (stainless steel-carbon steel) showed intermediate corrosion rate. In carbonation environments low corrosion rate were detected for both materials. With cyclical polarization with 5% NaCl, corrosion products and pitting were observed.

Palavras-chave : 316 stainless steel; corrosion, NaCl; carbonation; pore solution; pitting.

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