Corrosion Behavior of Rare Earth Cerium Based Trivalent Chromium Conversion Coating on Zinc

Abstract:

The present paper focused on the use of the salt of rare earth cerium as corrosion inhibitor of Zinc by using cathodic electrolytic passivation method. The corrosion resistance and the microphology of the cerium passivation film were studied by the methods of electrochemical method, scanning electron microscopy (SEM). From the results, it was shown that good corrosion resistance of cerium-based trivalent chromium conversion coating was obtained when the compositions were as follows: Ce (SO₄)₂, 6g/L; Cr₂(SO₄)₃, 18.9g/L and NaNO₃; current density, 2A/dm²; temperature, 40 oC; time, 60s. SEM revealed that the cerium trivalent chromium conversion coatings formed uniform cerium hydroxide and chrimuim hydroxide deposition on the surface of Zinc.

• Periodical: Advanced Materials Research (Volumes 881-883)
• Pages: 1165-1170
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.881-883.1165
• Online since: January 2014
• Authors: Shu Ting Miao, Sheng Han*, Lifeng Hao
• Keywords: Cerium Based Trivalent Chromium Passivation Coating, Corrosion Resistance, Electrochemical Polarization

References

[1] H. Bhatt, Trivalent Chromium Conversion Coating for Corrosion Protection of Aluminum Surface, (2009).

[2] Z. Zeng, A. Liang, J. Zhang, Electrochemical corrosion behavior of chromium–phosphorus coatings electrodeposited from trivalent chromium baths, Electrochimica Acta, 53 (2008) 7344-7349.

DOI: 10.1016/j.electacta.2008.03.081

[3] W. -K. Chen, C. -Y. Bai, C. -M. Liu, C. -S. Lin, M. -D. Ger, The effect of chromic sulfate concentration and immersion time on the structures and anticorrosive performance of the Cr (III) conversion coatings on aluminum alloys, Applied Surface Science, 256 (2010).

DOI: 10.1016/j.apsusc.2010.03.003

[4] P. Wang, X. Dong, D.W. Schaefer, Structure and water-barrier properties of vanadate-based corrosion inhibitor films, Corrosion Science, 52 (2010) 943-949.

DOI: 10.1016/j.corsci.2009.11.017

[5] T. PENG, R. MAN, Rare earth and silane as chromate replacers for corrosion protection on galvanized steel, Journal of Rare Earths, 27 (2009) 159-163.

DOI: 10.1016/s1002-0721(08)60212-4

[6] P. Podsiadlo, B.S. Shim, N.A. Kotov, Polymer/clay and polymer/carbon nanotube hybrid organic–inorganic multilayered composites made by sequential layering of nanometer scale films, Coordination Chemistry Reviews, 253 (2009) 2835-2851.

DOI: 10.1016/j.ccr.2009.09.004

[7] L. Sziráki, E. Kuzmann, K. Papp, C.U. Chisholm, M.R. El-Sharif, K. Havancsák, Electrochemical behaviour of amorphous electrodeposited chromium coatings, Materials Chemistry and Physics, 133 (2012) 1092-1100.

DOI: 10.1016/j.matchemphys.2012.02.021

[8] W. Chunyu, Z. Qiang, Z. Ji, W. Gaohui, Study on Anticorrosive Cerium Conversion Coating of Cf/6061Al Composite Surface, Journal of Rare Earths, 24 (2006) 64-67.

DOI: 10.1016/s1002-0721(07)60324-x

[9] G. Kong, L. Liu, J. Lu, C. Che, Z. Zhong, Study on lanthanum salt conversion coating modified with citric acid on hot dip galvanized steel, Journal of Rare Earths, 28 (2010) 461-465.

DOI: 10.1016/s1002-0721(09)60134-4

[10] D. -c. Chen, J. -f. Wu, Y. -q. Liang, S. -l. Ye, W. -f. Li, Preparation of cerium oxide based environment-friendly chemical conversion coating on magnesium alloy with additives, Transactions of Nonferrous Metals Society of China, 21 (2011).

DOI: 10.1016/s1003-6326(11)60948-5

[11] Y. -T. Tsai, K. -H. Hou, C. -Y. Bai, J. -L. Lee, M. -D. Ger, The influence on immersion time of titanium conversion coatings on electrogalvanized steel, Thin Solid Films, 518 (2010) 7541-7544.

DOI: 10.1016/j.tsf.2010.05.042

[12] M. -r. Yuan, J. -t. Lu, G. Kong, C. -s. Che, Self healing ability of silicate conversion coatings on hot dip galvanized steels, Surface and Coatings Technology, 205 (2011) 4507-4513.

DOI: 10.1016/j.surfcoat.2011.03.088

[13] Y. Kobayashi, Y. Fujiwara, Effect of SO42− on the corrosion behavior of cerium-based conversion coatings on galvanized steel, Electrochimica Acta, 51 (2006) 4236-4242.

DOI: 10.1016/j.electacta.2005.11.043

[14] G. Kong, L. Lingyan, J. Lu, C. Che, Z. Zhong, Corrosion behavior of lanthanum-based conversion coating modified with citric acid on hot dip galvanized steel in aerated 1  M NaCl solution, Corrosion Science, 53 (2011) 1621-1626.

DOI: 10.1016/j.corsci.2011.01.038

[15] A.L. Rudd, C.B. Breslin, F. Mansfeld, The corrosion protection afforded by rare earth conversion coatings applied to magnesium, Corrosion Science, 42 (2000) 275-288.

DOI: 10.1016/s0010-938x(99)00076-1

[16] D. -c. Chen, W. -f. Li, W. -h. Gong, G. -x. Wu, J. -f. Wu, Microstructure and formation mechanism of Ce-based chemical conversion coating on 6063 Al alloy, Transactions of Nonferrous Metals Society of China, 19 (2009) 592-600.

DOI: 10.1016/s1003-6326(08)60318-0