Electrochemical noise analysis of galvanized steel immersed in saturated Ca(OH){sub 2} solutions
- IPN Unidad Merida, Merida Yucatan (Mexico). Centro de Investigaciones y de Estudios Avanzados
Steel of the type UNS G10400 was galvanized by using a commercial Hot Dip Galvanizing method. The coated steel was immersed in a saturated Ca(OH){sub 2} solution (pH {approx} 12.4) and in a saturated Ca(OH){sub 2} + 0.5M KOH solution (pH {approx} 13.4). The Noise Potential (NP) and the Current Noise (CN) were measured simultaneously while the coated steel was kept immersed in the solution. The Noise Potential was measured against a Saturated Calomel Electrode(SCE) and by using an electrometer; whereas the CN was measured between two identical samples using a zero resistance ammeter. The relationship between the performance of the Zn coating and the noise information obtained is discussed. The electrochemical NP was found to be reasonably correlated to the corrosion rate of the coated steel. The CN pattern and the standard deviation of the CN was found to be well correlated with the corrosion rate, thus it was possible to establish a relationship between the CN and the behavior of the steel immersed in the different solutions.
- OSTI ID:
- 350133
- Report Number(s):
- CONF-980316--
- Country of Publication:
- United States
- Language:
- English
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