 ISSN 0235-7216 ISSN 2424-4538 (online) |
2008 m. Nr. 1 Corrosion behaviour of phosphated reinforcing steel in alkaline media contaminated with chloride ions
The protective properties of three crystalline and one amorphous phosphate films on the surface of a reinforcing steel bar were examined in two different media: alkaline chloride solution and reinforcing concrete, used in the construction of bridges. Accelerated corrosion tests in a neutral salt spray chamber and immersion in a 5% NaCl solution were applied. Open circuit (corrosion) potential mapping and EIS were used for corrosion performance characterization, and AFM was used for surface morphology studies. According to the corrosion behaviour results obtained under various test conditions, the medium weight crystalline F11 phosphate film composed of Zn and Ca phosphates ensured the most effective protection of steel. Under the neutral salt spray chamber conditions, the reinforcing steel bars covered with different phosphate films in the concrete specimens exhibited very similar corrosion behaviour. Keywords: phosphate coating, reinforcing steel, corrosion, chloride, alkaline solution |
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