ELECTROCHEMICAL BEHAVIOR OF Fe-20Cr NANOCRYSTALLINE COATINGS

J Chin Soc Corr Pro

2006, Vol. 26

Issue (1): 11-18 DOI:

Research Report

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ELECTROCHEMICAL BEHAVIOR OF Fe-20Cr NANOCRYSTALLINE COATINGS

Guozhe Meng;Ying Li;Fuhui Wang

中国科学院金属研究所;金属腐蚀与防护国家重点实验室

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Abstract Fe-20Cr nanocrystallized coatings (NC) were prepared by magnetron sputtering on a glass substrate.The potentiodynamic polarization of Fe-20Cr cast alloy and NC were measured respectively in 0.05 mol/L H2SO4+0.25 mol/L Na2SO4 and 0.05 mol/L H2SO4+0.5 mol/L NaCl solutions.The results showed that NC has greater trend to be auto-passivated in both solutions and the passive current density increased about 2 order magnitude compared with cast alloy.In solution containing Cl-,the passivity region of NC is 2 times than that of cast alloy.It indicated that the pitting resistance of NC was greatly improved.The semiconducting properties of the passive films formed on NC and cast alloy in both solutions were investigated by capacitance measurements.The results showed that Fe-20Cr cast alloy has poor resistance to pitting corrosion in chloride acidic solution due to its p-type semiconducting passive film.However,the passive film on Fe-20Cr NC was a n-type semiconductor which had a higher transpassivation potential and therefore higher resistance to pitting corrosion.The passive current density of NC was higher because of the higher donor/acceptor density in the passive film.The investigations showed that the type of passive films is responsible for the electrochemical behavior difference between NC and cast alloy.

Key words: magnetron sputtering nanocrystalline pitting corrosion Mott-Schottky plot

Received: 01 December 2004

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TG174.41

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Guozhe Meng; Ying Li; Fuhui Wang. ELECTROCHEMICAL BEHAVIOR OF Fe-20Cr NANOCRYSTALLINE COATINGS. J Chin Soc Corr Pro, 2006, 26(1): 11-18 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2006/V26/I1/11

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