Corrosion resistance of Al–Cu–Fe alloy powder coated with silica using an ultrasound-assisted sol–gel method

• Published in: Corrosion science Vol. 73; pp. 292 - 299
• Main Authors: Liang, Bo, Wang, Guodong, Zhang, Baoyan, Zhang, Xiaoming
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.08.2013; Elsevier
• Subjects: A. Aluminum alloys; Alloy powders; ALUMINUM ALLOYS (50 TO 99 AL); Aluminum base alloys; Applied sciences; B. Erosion; B. Ultrasonics; C. Acid inhibition; C. Oxide coatings; COATINGS; COPPER ALUMINUM ALLOYS; CORROSION; Corrosion environments; CORROSION PROTECTION; Corrosion resistance; Exact sciences and technology; Lubrication; Media; Metals. Metallurgy; POWDERS; PREALLOYED POWDERS; Production techniques; Protective coatings; Sol gel process; Surface treatment; SYNTHESIS (INORGANIC COMPOUNDS); Ultrasonic testing; A. Aluminum alloys; B. Erosion; C. Acid inhibition; C. Oxide coatings; B. Ultrasonics; Aluminium base alloys; Aluminium; Powder metallurgy; Coatings; Silica; Corrosion resistance; Corrosion; Sol gel process; Copper alloy; Erosion
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2013.04.018

•Ultrasonic power and irradiation time had great influence on the coating process.•Little aggregate was found between Al–Cu–Fe powder during the coating process.•A smooth and dense coating could be obtained through the use of ultrasound.•The corrosion protection efficiency of the coated powder reached 99.1%. Al–Cu–Fe alloy powder, a high-effective lubrication oil additive, was coated by conventional sol–gel method employing tetraethoxysilane (TEOS) as the precursor for purpose of improving its corrosion resistance. The best condition was obtained according to an orthogonal experiment (L9(34)). Then, the sol–gel method was modified by employing ultrasound to study the effects of both the ultrasonic power and irradiation time on the coating process. Finally, the coated powder had an high corrosion resistance in the acid media of pH 1. The obtained samples were characterised by FTIR, XRD, SEM and EDS.