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| ELECTRONIC SPECKLE PATTERN INTERFEROMETRY MEASUREMENT OF 304 STAINLESS STEEL PITTING POTENTIAL |
| TIAN Wenming, DU Nan, ZHAO Qing |
| Key Laboratory of Nondestructive Test, Ministry of Education, Nanchang Hangkong University, Nanchang 330063 |
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Abstract The polarization curves of 304 stainless steel in 3.5% NaCl solution at different potential scanning speed was measured by dynamic potential scanning method, and its pitting potential in NaCl solution with different concentration, temperature and pH value was investigated by electronic speckle pattern interferometer (ESPI) and dynamic potential scan technique. The result indicated that the influence of potential scanning speed on corrosion potential, pitting potential and the size of the hysteresis loop of 304 stainless steel was little when it was 0.3~6 mV/s. The pitting corrosion sensitivity of 304 stainless steel increased with solution concentration and temperature rising and reduced with pH value rising.
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Received: 13 September 2011
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Corresponding Authors:
TIAN Wenming
E-mail: tianwenming.dhr@163.com
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