Influence of Copper and Iron on Corrosion of Gravity Die Cast Al–Si–Mg–Ni Alloys
Corrosion behaviour of three different Al–Si–Mg–Ni alloys by the combined influence of Cu and Fe addition was investigated. Highest mass loss rate of 28.475 mg · cm–2 · d–1 was observed in sample with 0.58 wt.% of Fe and 0.5 wt.% of Cu. On increasing the Cu to 2.98 wt.% and Fe to 1.07 wt.%, a decrease of 43.89% in mass loss rate was observed, confirming high corrosion resistance. Further, increasing Cu to 6.77 wt.% and Fe to 1.34 wt.%, shows an increase in mass loss rate by 20.32% when compared to the sample with 2.98 wt.% of Cu and 1.07 wt.% of Fe. Thus, the mass loss rate of the experimental alloys decreases first and then increases. The corrosion performance of the alloys was evaluated using immersion corrosion test as per BS 11,846 Method B. X-ray Diffraction, SEM with EDX and Optical Microscope (OM) were used to characterize the material.
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Document Type: Research Article
Publication date: March 1, 2018
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