Estimation for Relevance of Atmospheric Corrosion Initiation with Surface Texture of Several Metallic Materials by Electron Backscattering Diffraction

doi:10.11902/1005.4537.2019.232

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (6): 495-503 DOI: 10.11902/1005.4537.2019.232

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Estimation for Relevance of Atmospheric Corrosion Initiation with Surface Texture of Several Metallic Materials by Electron Backscattering Diffraction

PAN Chengcheng,MA Chao,XIA Dahai(

)

Tianjin Key Laboratory of Composite and Functional Materials, School of Material Science and Engineering, Tianjin University, Tianjin 300354, China

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Abstract

The relevance of the corrosion initiation in a chlorine ions containing atmosphere with the surface morphology, peculiarly the texture of metallic materials such as Q235B carbon steel, T91 steel, 7050 Al-alloy and LY12 Al-alloy was studied by means of an atmospheric corrosion chamber and electron backscattering diffraction (EBSD) technique. The results showed that the surface texture of Q235B has no significant influence on the initiation and development of uniform corrosion in the chlorine polluted atmosphere, which may be ascribed to that Q235B steel is activated in the test atmosphere. T91 steel tends to be corroded at grain boundaries, while pitting corrosion is apt to initiate on the grain surface with high surface energy for 7050 Al-alloy and LY12 Al-alloy. Besides, for the metallic materials sensitive to local corrosion, the corrosion of which is likely to occur at sites where the passivation film tends to be destroyed easily, in other words, the passivation film has poor stability at grain boundaries and on spots with high surface energy.

Key words: atmospheric corrosion EBSD crystal texture preferred orientation

Received: 15 March 2019

ZTFLH:

O646

Fund: National Natural Science Foundation of China(51701140)

Corresponding Authors: Dahai XIA E-mail: dahaixia@tju.edu.cn

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Cite this article:

PAN Chengcheng,MA Chao,XIA Dahai. Estimation for Relevance of Atmospheric Corrosion Initiation with Surface Texture of Several Metallic Materials by Electron Backscattering Diffraction. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 495-503.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.232 OR https://www.jcscp.org/EN/Y2019/V39/I6/495

Table 1 Chemical composition of experimental steel (mass fraction / %)

Table 2 Chemical composition of aluminium alloy for experiment (mass fraction / %)

Fig.1 Surface topographies of Q235B steel (a), T91 steel (b), 7050 Al alloy (c) and LY12 Al alloy (d)detected area

Fig.2 Total Euler angle diagram

Fig.3 Sample placement pattern (RD: rolling direction; TD: transverse direction; ND: normal direction)

Fig.4 Pole figures at equatorial plane for crystal planes: (a) {001}, (b) {011}, (c) {111}

Fig.5 IPF mapping of Q235B steel: (a) transverse (X0), (b) longitudinal (Y0), (c) normal direction (Z0), (d) correspondence between crystal plane orientation and color

Fig.6 IPF distribution of horizontal (X0), longitudinal (Y0) and normal (Z0) direction of Q235B steel: (a) scatter diagrams, (b) contour map

Fig.7 Q235B steel surface corrosion morphologies changes with 7 h (a), 15.5 h (b), 20 h (c) and compari-son between surface corrosion morphology and surface IPF mapping (d)

Fig.8 Total Euler angle diagrams of T91 steel (a), 7050 Al alloy (b) and LY12 Al alloy (c)

Fig.9 Pole figures (equatorial plane) of T91 steel (a), 7050 Al alloy (b) and LY12 Al alloy (c)

Fig.10 IPF mapping at X0 direction (a1~c1), surface morphologies after 10 h salt spray test (a3~c3), and the comparison between them respectively for corresponding the corrosion behavior to the crystal orientation at metal surface (a2~c2) of T91 steel (a1~a3), 7050 Al alloy (b1~b3) and LY12 Al alloy (c1~c3)

Fig.11 Scatter diagrams (a1~a3) and contour maps (b1~b3) of T91 steel (a1, b1), 7050 Al alloy (a2, b2) and LY Al alloy (a3, b3)

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