Influence of reinforcement grade and matrix composition on corrosion resistance in cast aluminium matrix composites (A3xx.x/SiC) on 80 percent HR

摘要

A study of the influence of the SiCp proportion of four aluminium metal composites (A380/SiC/10p, A380/SiC/20p, A360/SiC/10p y A360/SiC/20p) on 80 percent HR at 25 and 50 deg C, simulated under climatic chamber. The matrix of A360/SiC/xxp composites is virtually free of Cu while the A380/SiC/xxp matrix contains 1.39-1.44wt percent Ni and 3.13-3.45wt percent Cu. The kinetics of the corrosion process were studied on the basis of gravimetric tests. The nature of corrosion products was studied as a function of the reinforcement proportion, matrix concentration and test conditions. At the humidity environment tested, both the material corrosion resistance and the stability of the passive layer were high. The damage was low and increased with temperature, SiCp proportion and Cu matrix composition.