PENGARUH KUAT ARUS TERHADAP KEKERASAN, STRUKTUR MIKRO DAN LAJU KOROSI LAPISAN CHROMATE COATING PADA LOGAM ALUMINIUM
The objective of this reseach is to find out the effect of currents to the process of chromate coating on microstructure, hardness and corrosion rate of aluminium (Al). Aluminium was coated with copper (Cu), nickel (Ni) and chromium (Cr) variated by current (60 A, 90 A, and 120 A). Corrosion rate wa...
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| Format: | Thesis |
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[Yogyakarta] : Universitas Gadjah Mada
2011
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| Summary: | The objective of this reseach is to find out the effect of currents to the process
of chromate coating on microstructure, hardness and corrosion rate of aluminium
(Al). Aluminium was coated with copper (Cu), nickel (Ni) and chromium (Cr)
variated by current (60 A, 90 A, and 120 A).
Corrosion rate was tested using three-electrode cell method with 0.3% NaCl
solution. Micro Vickers indentation was used for measuring surface hardness using
load of 10 grams. An optical microscope was used to observe cross-sectional
microstructure.
The highest value of surface hardness and the lowest corrosion rate are
obtained on specimens of Al/Cu/Ni/Cr by the current 90 A. Increasing current can
improve corrosion resistance and surface hardness of the specimen. However, the
optimum currents is 90 A, but when currents is increased again it increased the
corrosion rate and decreased the surface hardness of the specimen. From
microstructure observation of the cross-section of specimen show thin layer on the
specimen surface. This layer increase the corrosion resistance and the surface
hardness of the specimen. |
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