Defect investigation of strut tube assembly

Sujata, M and Madan, M and Bhaumik, SK (2008) Defect investigation of strut tube assembly. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

Four tubes belonging to LH and RH strut assembly of an aircraft and the powdery substances collected from these tubes were forwarded to the laboratory for analysis. The powdery substances were brownish in colour, typical of oxide scales produced due to corrosion of steels. Compositional analysis indicated that the scales contained high amount of chlorine (Cl). Some individual particles in the scales showed Cl content as high as 5.5 wt%. Examination of the inner surface of the tubes confirmed severe corrosion in the form of pitting. Analysis suggests that the corrosion was due to presence of Cl and the most probable source of this corrodant appears to be the chloride residue left on the inner surface of the tube after the plating operation. In view of the above findings, it is suggested that the tubes in question may be withdrawn from service.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Aircraft;Strut assembly tube;Corrosion
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division
Depositing User: Ms. Alphones Mary
Date Deposited: 25 Jul 2011 12:05
Last Modified: 25 Jul 2011 12:05
URI: http://nal-ir.nal.res.in/id/eprint/9487

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