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Reinforcement of CuZn coatings obtained by electrodeposition from a free-of-cyanide alkaline solution containing Al2O3 hard particles

Almeida, A. P. R. de; Santos, F. D. D. dos; Mahnud, Z. A.; Carlos, I. A.; Tulio, P. C.;

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An alkaline free-of-cyanide electrodeposition solution using sorbitol as complexing agent was employed for obtaining metal-matrix-composite coatings of CuZn-Al2O3. These coatings consisted of CuZn as metal matrix and hard micrometric alumina (Al2O3) particles as the dispersed phase. These composite coatings could be employed in protection of metallic pieces subjected to erosion-corrosion, since they will combine corrosion resistance of the CuZn matrix and mechanical resistance given by the hard Al2O3 particles. It is shown that these coatings could be obtained from the proposed solution, but only in high electrodeposition cathodic current densities (ig), for ½ig½> 15 mAcm-2. Vickers microhardness (MH) of the composite coatings was significantly increased when comparing with pure CuZn coatings for ig of -25 and -30 mAcm-2. The increased microhardness is due to occluded Al2O3, since it was not observed grain refinement due to Al2O3. Based on these results, CuZn-Al2O3 composite coatings have prospects for erosion-corrosion protection.

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Palavras-chave: electrodeposition, CuZn-Al2O3 composite, sorbitol alkaline solution,

Palavras-chave: ,

DOI: 10.5151/chempro-s3ie2016-03

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Como citar:

Almeida, A. P. R. de; Santos, F. D. D. dos; Mahnud, Z. A.; Carlos, I. A.; Tulio, P. C.; "Reinforcement of CuZn coatings obtained by electrodeposition from a free-of-cyanide alkaline solution containing Al2O3 hard particles", p. 35-42 . In: Proceedings of 2nd International Seminar on Industrial Innovation in Electrochemistry . São Paulo: Blucher, 2016. São Paulo: Blucher, 2016.
ISSN 2318-4043, DOI 10.5151/chempro-s3ie2016-03

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