Optimization of sol–gel coating on the surface of aluminum alloy powder for corrosion protection in the condition of ultrasonic radiation

Abstract

In order to improve the corrosion resistance of an aluminum alloy powder (aluminum-copper-iron), a traditional sol-gel process (tetraethoxysilane [TEOS] was used as the precursor) was carried out in accordance with orthogonal experiments (L 9 (3 4 )) in the first step. Solvent, reaction temperature, molar concentration of TEOS, and molar concentration of water were selected as the controllable factors. The optimum condition was obtained by means of the orthogonal analysis. In the second step, the encapsulation process was carried out under ultrasonic radiation based on the optimal reaction condition obtained from the traditional sol-gel process. We also studied the effects of ultrasonic power and radiation time on the encapsulation process. Finally, the corrosion inhibition factor of the encapsulated powder was reaching up to 99.5% in the hydrochloric acid (1 mol/L) solution. And the mean particle size of encapsulated powder was only 5.9% larger than that of the unencapsulated powder. Combined with the FTIR, XRD, DLS, SEM, and EDS analyses, it was concluded that an extremely thin layer had encapsulated on the aluminum alloy powder.

Evaluation of cavitation erosion resistance of copper alloy in different liquid media

“…One the other hand, variation in operation parameters such as the distance between the ultrasonic horn tip and target surface can also lead to considerably different cavitation erosion results . The joint action of ultrasonic effect and liquid properties might alter the cavitation erosion resistance of materials . In this connection, the copper alloy has been widely used in marine engineering and the risk of cavitation erosion is high.…”