EFFECTS OF VARIOUS PARTICULATES REINFORCEMENTS ON THE CORROSION RESISTANCE OF ALUMINUM ALLOY (AA2618) MATRIX COMPOSITE
Keywords:
Corrosion Composite, Reinforcement, Particles, Environment, Specimen, AluminumAbstract
Study on the effects of various particulate reinforcements on the corrosion resistance of aluminum alloy (AA2618) matrix composites in different environments has been carried out. Metallic permanent molds were used to cast specimens in which 0vol%, 5vol%, 10vol%, 15vol%, 20vol%, 25vol% and 30vol% each of AA2618/SiC, AA2618/TiC and AA2618/fly ash composites were made. The cast specimens were machined to different dimensions for gravimetric and potentiostatic corrosion rate tests in one mole hydrochloric (1MHCl), sodium hydroxide (1MNaOH) and sea water environments where these composite specimens are normally exposed while in service. The results of the tests show that corrosion penetration rates of both gravimetric and potentiostatic of the composite samples increased along with increase in the vol% addition of these particles in the matrix of the alloy in these environments. The reason for this is that these particles promote localized corrosion within the matrix of the alloy by acting as anodic sites. The presence of these particles in the matrix of the alloy also helped in the infringements of dislocation movements in the matrices of the composites which are associated with particle clusters that generate high stress triaxiality in such regions. The increase in dislocation density resulted in high stress levels within the composites and this phenomenon caused high corrosion susceptibility as the percentages of these particles increased in the matrix of the alloy. AA2618/SiC immersed in NaOH environment recorded severe corrosion attack while least corrosion attack was recorded on composites immersed in sea water environment.
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