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| STUDIES ON THE COMPOSITION AND STRUCTURE OF THE CHROMATE CONVERSION COATINGS ON THE SURFACE OF ALUMINUM AND ITS ALLOY Ⅱ. IR, ELECTRON DIFFRACTION, X-RAY DIFFRACTION AND DTA STUDY |
| Ni Hongbin Yan Manming Yu Zuzhan (Department of Chemistry; Fudan University; Shanghai) |
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Abstract The chemical composition and crystallographic structure of chromate conversion coating on the surface of aluminum and its alloy were investigated by using infra-red(IR), X-ray diffraction, electron diffraction and DTA methods. It was found that the spectra of chromate conversion coating on the surface of aluminum and its alloy are similar to those of γ-CrOOH. Furthermore, a comparison of the IR spectra of the chromate conversion coating on the surface of aluminum with those for Cr_2O_3 indicates that the amount of Cr_2O_3 in the coating does not exceed 5％. The results of X-ray diffraction and electron diffraction measurements show that these chromate conversion coatings are non-crystalline. An appreciable exothermic peak at 310℃ was found on the DTA curve and it is due to the transformation of chemical composition and structure of chromate conversion coating on aluminum. The IR and X-ray diffraction spectra of samples subjected to DTA measurement(range of temp. 20-600℃, heating rate 10℃/min.)indicate the existence of crystalline Cr_2O_3.
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Received: 25 April 1987
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Cite this article:
Ni Hongbin Yan Manming Yu Zuzhan (Department of Chemistry; Fudan University; Shanghai). STUDIES ON THE COMPOSITION AND STRUCTURE OF THE CHROMATE CONVERSION COATINGS ON THE SURFACE OF ALUMINUM AND ITS ALLOY Ⅱ. IR, ELECTRON DIFFRACTION, X-RAY DIFFRACTION AND DTA STUDY. J Chin Soc Corr Pro, 1987, 7(2): 121-126.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1987/V7/I2/121
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[1] 倪红兵;张冠生;郁祖湛;赵国庆;董树忠;中国腐蚀与防护学报,7(1) ,50(1987)
[2] Lawrence, M. C.: Robertson, G. N., Molecular Physics, 43, 193(1981)
[3] Christen, A. N., Acta Chem. Scand., A30, 133(1976)
[4] Samuels, S.; Kevin, W., Metal Finishing, 6, 49(1981)" |
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