Analisa korosi pada sambungan repair body mobil menggunakan pengelasan oxy-acetylene

Azwar Azwar, Boihaqi Boihaqi, Yuniati Yuniati

Abstract


Corrosion in cars is influenced by environmental factors, namely humidity, weather, sea air, rainwater, muddy roads; and also by mechanical factors such as bumps and scratches. Car parts that are considered prone to corrosion are the areas where the welding joints or folds are located, which causes loss or rotten of body. The repair process is carried out by connecting the porous parts using oxy acitilline welding known as the Repair Body process. Welding uses a low carbon steel plate, or galvanized steel plate, then grinding and followed by a coating and painting process. However, in a relatively short period of time the section experienced deflection which was predicted due to corrosion in the weld joint area. This article will analyze the corrosion rate of oxiacitilline welding joints between AISI 4130 (car body) and ST 37 steel plates and Galvanized steel plates. The aim is to study the effect of the type of connection material, the effect of coating, the effect of immersion duration, and the effect of the corrosion medium on the corrosion rate. The determination of the corrosion rate refers to ASTM G31-72 (Standard Practice for Laboratory Immersion Corrosion Testing of Meta). The results showed that the highest corrosion rate occurred in the AISI 4130 specimen (car body) which was connected to ST 37 with HCl solution corrosion media, namely 5.2919 mmpy, while in NaCl media the corrosion rate was much lower, namely 0.1337 mmpy, and aquades amounting to 0.1098 mmpy with an immerson time of 272 hours. Meanwhile, the corrosion rate in AISI 4130 specimens connected with galvanized steel shows a slower corrosion rate compared to joints with ST 37 steel. Likewise, the coating process shows a decrease in the corrosion rate well.


Keywords


oxyacitilline welding, body repair, corrosion rate, immersion test, corrosion media, coatin

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DOI: http://dx.doi.org/10.30811/jowt.v2i2.2084

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