PENGARUH ARTIFICIAL AGING TERHADAP LAJU KOROSI BALING-BALING KAPAL MOTOR BERBAHAN ALUMINIUM

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Publication Type:

Journal Article

Source:

Teknologi, Volume 4, Number 2 (2011)

Abstract:

Ship Propeller for motor boat using aluminum and fabricated by the casting process and
has an aerodynamic shape with a curve that does not allow for a strengthening by cold work using
the rolling method, but the reinforcement can be done with the formation of the second phase
through a process of diffusion and precipitation, one of which is to aging process. On the other
hand, strengthened by the formation of the second phase will affect the corrosion resistance of the
material due to the emergence of a potential difference of the two existing phases that will result in
galvanic corrosion. This study aimed to determine the effect of aging on changes in physical and
mechanical properties and corrosion resistance of the ship propeller made of aluminum 4343
series. To determine the effect of aging on the physical and mechanical properties and corrosion
resistance, aging process done with a variable temperature of 1200 , 1700 and 2200 C and a
variable time 45, 90, 180 and 240 minutes. Folowed by testing, including test hardness, wear, grain
size, micro structure and the rate of corrosion. The highest hardness is obtained at the aging
temperature of 1700 C and 180 min holding time of 41 HRA, whereas the lowest hardness obtained
by aging temperature 1200 C with a holding time of 240 minutes of 20.1 HRA. Meanwhile, the wear
test results showed that the material before the aging has value wear is 0.0000051295 gr/mm2 sec
after the aging the value is close to 0 (zero). While the results of –grain size test obtained at a
temperature aging of 1200 C grain size relative stable at ranged between 36 μm, while the smallest
grains obtained from the aging time of 180 minutes with the aging temperature of 2200 C that is
equal to 28 μm and The biggest item is obtained from the aging time 180 minutes with a
temperature of 1700 C is equal to 42 μm. Hardness test results obtained from the price of the
highest hardness is obtained from the aging time 180 minutes with a temperature of 1700 C that is
equal to 41 HRA, while corrosion resistance tests performed on material aging results with the
temperature 1700 C and hold time of 180 minutes is obtained results the corrosion rate is2, 92 mm
/ yr, when compared with the raw materials that have corrosion rate 3.72 mm / yr mean corrosion
rate decreased by 21.5%.

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