Corrosion Behaviour of Heat Treated 1060 Aluminium in Dilute Acid Solutions
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The electrochemical corrosion behaviour of untreated, quenched and annealed cold rolled 1060 aluminium specimens was
studied through weight loss measurement, potentiodynamic polarization technique and optical microscopy in 0.5, 1, 1.5 and
2M H2SO4 and HCl solutions. Data obtained from the tests show that the quenched specimens had the highest corrosion
resistance as a result of its hardened surface due to retained saturated solid solution. The untreated aluminium specimens
exhibited a lower corrosion resistance than the quenched specimens though the corrosion rates from HCl solution are
generally higher than values obtained from H2SO4. Annealed specimens had the highest corrosion rate as its passive
protective film resulting from the rearrangement of its microstructural constituents could not sustain the aggressive attack of
corrosive anions within the acid solution. Micrographs from optical microscopy showed a severely deteriorated annealed
morphology resulting from depletion of the grain boundary. Corrosion pits were observed in the untreated specimens while
the quenched specimens showed limited deterioration due to general corrosion
Keywords
TJ Mechanical engineering and machinery