Corrosion Investigation of Stir Cast Zn-27Al Based Hybrid Composites Reinforced with Quarry Dust and Silicon Carbide Particles

Abstract

This paper investigates the corrosion behaviour of Zn-27Al based hybrid composites reinforced with quarry dust (QD) and silicon carbide particles (SiC p ). The Zn-27Al hybrid composites containing 8 wt% and 10 wt% SiC p -QD particles reinforcement with varied weight percentage of 0, 25, 50, 75 and 100% quarry dust respectively were synthesized using stir casting technique. The corrosion behaviour of the composites was investigated in 0.3M H 2 SO 4 and 3.5 wt% NaCl solution at 25ºC using electrochemical methods in accordance with ASTM G59-97(2014) standard. The results show that for 8 wt% reinforcement, the hybrid composites A 2 and A 3 (corresponding to 50% SiC p : 50% QD and 25% SiC p : 75% QD respectively) having corrosion rate of 0.006 mmpy displayed superior corrosion resistance. For 10 wt% reinforcement, hybrid grades B 1 (75% SiC p : 25% QD) , B 2 (50% SiC p : 50% QD) and B 3 (25% SiC p : 75% QD) has superior corrosion rate of 0.0172, 0.0126 and 0.0135 mmpy respectively while B 4 (corresponding to 100% QD) shows the most superior corrosion rate of 0.00315 mmpy when compared with the monolithic alloy having corrosion rate of 0.213 mmpy all in marine environment (3.5 wt% NaCl solution). However, except for composite grade A 2 with 0.055 mmpy corrosion rate and B 4 (corresponding to 100% QD) with superior corrosion rate of 0.0143 mmpy in 0.3M H 2 SO 4 medium, all other composite grades performed poorly in the acidic medium.

Effect on corrosion behaviour of the surface of aluminium 4.5 Cu with bamboo leaf ash composites by laser treatment

“…These tests were conducted before and after laser surface melting. Corrosion immersion test [16][17][18] was conducted for as-cast and LSM composites. Then the samples were mounted with phenol resin that resisted corrosion caused due to salt solutions.…”