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In-Situ Repair Quality Assurance Tool for Inspection of Metallic Surface

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In-Situ Repair Quality Assurance Tool for Inspection of Metallic Surface Preparation


A portable, handheld water contact angle measurement device, the Surface Analyst, was used to develop a quality assurance inspection technique to assess processing steps during the sol-gel metallic structural bond preparation repair process. This inspection technique was employed to evaluate the surface energy of aluminum adherends, aircraft alloys 2024-T3 and 7075-T6, in order to determine whether acceptable performance of processing steps occurred during the metallic bond surface preparation.  Water contact angle data was collected after both the abrasion and sol-gel application steps. Process variations and contaminants were introduced to determine their effect on mechanical properties with respect to water contact angle.  A down select test process was completed using discriminator panels and wedge crack extension test. The correlation of water contact angle with testing was used to establish pass/fail criteria for quality assurance of the bond preparation repair process. A preliminary pass/fail criterion was established for the in-situ bond preparation repair process steps with a confidence level of 90%. These results demonstrate the potential of Surface Analyst water contact angle measurements to serve as a quality insurance inspection technique to quantitatively assess aluminum surface condition during the metallic repair structural bond preparation process.


Authors: Justin T. Massey, Edward W. Harris, Brietta Oakley, Elizabeth Kidd, Giles Dillingham


Conference: CAMX 2016 – Anaheim


SKU/Code: TP16-0088


Pages: 17

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