Rizqi Ilmal Yaqin, Juniawan Preston Siahaan, Yuniar Endri Priharanto, Bobby Demeianto, Mula Tumpu, M. Zaki Latif Abrori and Bambang Hari Priyambodo
Keywords: Brass, corrosion rate, artificial seawater, salinity, pH
Abstract:
<p>The propeller was an important component in the fishing vessels
marine propulsion system. Brass was widely used as a fishing vessel propeller.
Brass was chosen because it has good mechanical properties and good corrosion resistance
to seawater. The content of seawater in Indonesia has levels of 3% – 3,5% NaCl.
In addition to the level of Ion Cl<sup>-</sup>, environmental factors can be
affecting the corrosion rate of material or metal. The environmental factors
that affect the corrosion rate are the level of salinity, pH, DO, temperature
and TDS. The objective of the present work was to elucidate the corrosion rate
of brass in artificial seawater in Indonesia with exposure time. Measurement of
the corrosion rate of brass used the principle of weight loss according to ASTM G31.
The result of immersion brass in the artificial seawater shows that the
corrosion rate decreases in the 1-to-10-day exposure time due to the increase
in salinity levels above 30 ‰. While the results of exposure time immersion
above 15 days tend to increase the corrosion rate due to a decrease in pH
level.<br></p>
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