The electrochemical behaviors of high temperature oxide film formed on the sputtered microcrystalline coating of M38 alloy (mc-M38) were investigated by potentiodynamic and electrochemical impedance spectroscopy (EIS) techniques in 3.5% NaCl solution. Mott-Schottky analysis was used to study the semi-conductive properties of the surface oxide. The results of the capacitance measurements showed that the oxide films on both the coating and the cast alloy were p-type semiconducting characteristics. Both the carrier density (Na)and the flat band potential (Efb) were obviously frequency-dependent, and the optimal frequency range was from 1000 to 1500 Hz. The oxidized coating exhibited higher protectivity than the oxidized cast alloy due to the lower carrier density compared with that of the oxidized cast alloy. The EIS data of the long-term immersing tests suggested that the oxide film served as an inner-barrier layer against chloride ions. The penetration of the aggressive ions into the surface oxide resulted in the decreased polarization resistance as a function of the immersion time.
参考文献
| [1] | H Lou;S Zhu;F Wang .[J].Oxidation of Metals,1995,43:317. |
| [2] | H Lou;F Wang;L Bai .[J].Materials Science and Engineering,1990,A123:123. |
| [3] | F Wang;H Lou;W Wu .[J].Vacuum,1992,43:749. |
| [4] | H Lou;Y Tang;X Sun;H Guan .[J].Materials Science and Engineering,1996,A207:121. |
| [5] | S Geng;F Wang;S Zhu .[J].Oxidation of Metals,2002,57:231. |
| [6] | A Carnot;I Frateur;S Zanna;B Tribollet .[J].Corrosion Science,2003,45:2513. |
| [7] | C Liu;Q Bi;A Matthews .[J].Corrosion Science,2001,43:1953. |
| [8] | C Liu;Q Bi;A leyl;A mattthews .[J].Corrosion Science,2003,45:1243. |
| [9] | C Liu;Q Bi;A leyl;A mattthews .[J].Corrosion Science,2003,45:1257. |
| [10] | Tapan K. Rout .Electrochemical impedance spectroscopy study on multi-layered coated steel sheets[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2007(2):794-817. |
| [11] | F Snogan;C Blanc;G Mankowski;N Pebere .[J].Surface and Coatings Technology,2002,154:94. |
| [12] | F J Martin;G T Cheek;W E O'Grady;P M Natishan .[J].Corrosion Science,2005,47:3187. |
| [13] | S C Chung;J R Cheng;S D Chiou;H C Shin .[J].Corrosion Science,2000,42:1249. |
| [14] | V Barranco;S Feliu Jr;S Feliu .[J].Corrosion Science,2004,46:2203. |
| [15] | V Barranco;S Feliu Jr;S Feliu .[J].Corrosion Science,2004,46:2221. |
| [16] | J Pan;C Leygraf;R F A Jargelius-Pettersson;J Linden .[J].Oxidation of Metals,1998,50:431. |
| [17] | C G Oliveria;M G S Ferreira .[J].Corrosion Science,2003,45:123. |
| [18] | C G Oliveria;M G S Ferreira .[J].Corrosion Science,2003,45:139. |
| [19] | A M P Simoes;M G S Ferreira;B Rondot;M da Cunha Belo .[J].Journal of the Electrochemical Society,1990,137:82. |
| [20] | U Stimming .[J].Electrochimica Acta,1986,314:15. |
| [21] | P C Searson;R M Latanision;U Stimming .[J].Journal of the Electrochemical Society,1988,135:1358. |
| [22] | Elzbieta Sikora;Digby D. Macdonald .Nature of the passive film on nickel[J].Electrochimica Acta,2002(1):69-77. |
| [23] | F H Wang .[J].Oxidation of Metals,1997,48:215. |
| [24] | N B Hakiki;S Boudin;B Rondot;M Da Cunha Belo .[J].Corrosion Science,1995,37:1809. |
| [25] | N E Hakiki;M D C Belo .[J].Journal of the Electrochemical Society,1996,143:3088. |
| [26] | David R Lide.Handbook of Chemistry and Physics[M].Florida:CRC Press,2003 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%