Electrochemical corrosion behavior of nano-crystalline stainless steel coating with different phase composition

J Chin Soc Corr Pro

2008, Vol. 28

Issue (3): 129-134 DOI:

Research Report

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Electrochemical corrosion behavior of nano-crystalline stainless steel coating with different phase composition

中科院金属研究所

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Abstract The single-phase (α) and duplex-phase (α+γ) nano-crystalline coatings have been fabricated on glass substrate by DC magnetron sputtering. The electrochemical corrosion behavior of the two NC coatings in solutions of 0.25M Na2SO4 + 0.05M H2SO4 and 0.5M NaCl + 0.05M H2SO4 was investigated by using potentiodynamic polarization, EIS and SEM. The results showed that there was a large difference in the corrosion behavior between the single-phase (α) and the duplex-phase (α+γ) nano-crystalline coatings. The duplex-phased coating is shown to have exhibited a lower localized corrosion resistance and possessed a less stable passive film than the single-phase coating. A similar two-layer semiconductor passive film was formed on both coatings; however, a great increase in carrier densities could be responsible for the low stability of the passive film on the duplex-phase coating.

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Received: 26 September 2006

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. Electrochemical corrosion behavior of nano-crystalline stainless steel coating with different phase composition. J Chin Soc Corr Pro, 2008, 28(3): 129-134 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2008/V28/I3/129

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