Fonna S, Bin M Ibrahim Israr, Huzni S, Ikhsan M, Thalib S
Tsunami and Disaster Mitigation Research Center (TDMRC), Universitas Syiah Kuala, Jl. Prof. Ibrahim Hasan, Ulee Lheue, Meuraxa, Banda Aceh, 23232, Indonesia.
Department of Mechanical and Industrial Engineering, Universitas Syiah Kuala, Jl. Tgk. Syech Abdul Rauf No. 7, Banda Aceh, 23111, Indonesia.
Heliyon. 2021 Apr 5;7(4):e06608. doi: 10.1016/j.heliyon.2021.e06608. eCollection 2021 Apr.
This research aims to study the corrosion rate and characteristics of corrosion products of carbon steel due to exposure in the environment of Banda Aceh, Indonesia. The ASTM G50 was used as the basis for the specifications of the specimens for corrosion rate calculation. The corrosion rate was calculated based on ASTM G1. The features of corrosion products studied are morphological features, types, and chemical compounds of the rust. These characteristics were identified using scanning electron microscopy (SEM) and x-ray diffractometer (XRD). The corrosion rate of carbon steel was obtained using the weight-loss method. The study was conducted for twelve months, i.e. January to December of 2018. After one year of exposure, it was found that the highest corrosion rate occurred in the March-April period which was 0.024 mpy and falls into outstanding category of relative corrosion resistance. Various morphological features of corrosion products found during the period of exposure, including worm nest, bird's nest, globular, cotton ball, laminar, lath, bar, needle-shaped, and whisker structures. These structures were lepidocrocite (γ-FeOOH) and goethite (α-FeOOH). During twelve months of exposure, corrosion products formed were dominantly lepidocrocite and goethite. It was found that the lepidocrocite might transform into goethite through prolonged exposure time.
本研究旨在探究碳钢在印度尼西亚班达亚齐环境中暴露后的腐蚀速率及腐蚀产物特性。ASTM G50被用作计算腐蚀速率的试样规格依据。腐蚀速率根据ASTM G1进行计算。所研究的腐蚀产物特征包括锈的形态特征、类型和化合物。这些特征通过扫描电子显微镜（SEM）和X射线衍射仪（XRD）进行识别。碳钢的腐蚀速率采用失重法获得。该研究进行了十二个月，即2018年1月至12月。暴露一年后，发现最高腐蚀速率出现在3月至4月期间，为0.024密耳/年，属于相对耐腐蚀的优秀类别。在暴露期间发现了腐蚀产物的各种形态特征，包括虫巢状、鸟巢状、球状、棉球状、层状、板条状、棒状、针状和晶须状结构。这些结构为纤铁矿（γ-FeOOH）和针铁矿（α-FeOOH）。在十二个月的暴露期间，形成的腐蚀产物主要是纤铁矿和针铁矿。研究发现，通过延长暴露时间，纤铁矿可能会转化为针铁矿。
