Effect of Plasma Sprayed Coatings on Stress Corrosion Cracking of 08Cr2AlMo Steel in Saturated H2S Solution

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Three kinds of coating materials, namely Al2O3, Al2O3(87%)-TiO2(13%), and Cr2O3(92%) -TiO2(3%)-SiO2(5%), were plasma sprayed on specimens of 08Cr2AlMo steel. The corrosion performance of the specimens was determined by potentiodynamic polarization test, slow strain rate tensile (SSRT), and scanning electron microscope (SEM). The test results indicate that the plasma sprayed coatings do not show passivation in saturated H2S solution, but they have higher corrosion resistance than the bare 08Cr2AlMo steel. Furthermore, these coatings reduce SCC susceptibility of the steel in saturated H2S solution. The specimens treated by plasma spray have longer fracture time and larger area reduction. The SCC resistance depends largely on coating porosity, coating type and the bond strength between the coating and the substrate. Among the three coatings, the Cr2O3(92%)-TiO2(3%)- SiO2(5%) coating exhibits the lowest SCC susceptibility.

Info:

Periodical:

Key Engineering Materials (Volumes 373-374)

Main Theme:

Edited by:

M.K. Lei, X.P. Zhu, K.W. Xu and B.S. Xu

Pages:

593-596

DOI:

10.4028/www.scientific.net/KEM.373-374.593

Citation:

Y. F. Zhang et al., "Effect of Plasma Sprayed Coatings on Stress Corrosion Cracking of 08Cr2AlMo Steel in Saturated H2S Solution", Key Engineering Materials, Vols. 373-374, pp. 593-596, 2008

Online since:

March 2008

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$35.00

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[2] Y. F. Zhang, Y. Ding, X. F. Lu, et al. Materials Protection. 38(9)(2005), p.40.

[3] Y. F. Zhang: Phd. Thesis, Nanjing University of Technology, Nanjing (2007).

[4] E. Celik, I. Ozdemir, E. Avci, et al, Surf. Coat. Technol. 193(2005), p.297 (b) Cracking of coating (a) Porosity of coating Fig. 3 Flaws of plasma sprayed coatings Porosity Cracking.

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