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Proceedings Paper

Application of speckle technique in corrosion process monitoring of an aluminum alloy
Author(s): Jie Lu; Guang-ping Zou
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Paper Abstract

The aim of this work is to investigate the initiation stage of corrosion process of an aluminum alloy by dynamical speckle method. The test specimens are Al-2A12 alloy with thickness of 2mm which are immersed in the 3.5%, 1.3% sodium chloride solution and pure water. Three-point bending tests are employed and center displacement of the specimen is 2.5mm. The real-time speckle monitoring technique has been employed and the optical measuring system is built to observe the corrosion process in local region by means of measuring the local surface speckle activity of the specimens. A novel algorithm named improved inertia moment (IIM) is presented to predict the corrosion initiation tendency. Meanwhile average intensity method is recommended to contrast with IIM due to its validity in characterizing the corrosion initiation process of aluminum alloy. The results show the trends representing the corrosion initiation, calculated by two different methods are almost the same. Moreover the presented arithmetic can simplify the heavy numerical calculation task and has relatively higher efficiency than inertia moment method. The full-field information of the investigated local region which denoted the corrosion situation is demonstrated in form of three-dimensional image. The results are according with the actual situation. Thus the presented arithmetic is feasible and effective.

Paper Details

Date Published: 14 April 2010
PDF: 7 pages
Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75224T (14 April 2010); doi: 10.1117/12.851474
Show Author Affiliations
Jie Lu, Harbin Engineering Univ. (China)
Guang-ping Zou, Harbin Engineering Univ. (China)


Published in SPIE Proceedings Vol. 7522:
Fourth International Conference on Experimental Mechanics
Chenggen Quan; Kemao Qian; Anand Krishna Asundi; Fook Siong Chau, Editor(s)

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