Abstract
This study investigated the potentiodynamic corrosion behavior of carbon fiber reinforced plastic (CFRP) and automotive rolled mild steel alloy (SPCC alloy) under different surface roughness conditions. Electrochemical characterization was performed using a potentiodynamic corrosion test with 5.0 wt.% NaCl aqueous solution at 25 ± 2 °C, while microstructural and compositional changes before and after corrosion were evaluated using field emission scanning electron microscopy (FE-SEM) and energy dispersive spectroscopy (EDS), respectively. The CFRP and SPCC corrosion rate increased as surface roughness increased. Generally, SPCC corroded faster than CFRP. The surface composition of CFRP was not affected by corrosion, regardless of the surface roughness conditions. Conversely, SPCC exhibited remarkable changes due to the formation of oxides, and its corrosion was more severe than that of CFRP as surface roughness increased. We used a double flat electrode cell to conduct a galvanic corrosion test in this study at 25 ± 2 °C. In this galvanic corrosion test, we studied different kinds of surface roughness for SPCC specimens under the CFRP material in its as-received condition and #200 condition. We confirmed that the results of galvanic corrosion for this study have a difference in corrosion amount and corrosion rate of SPCC specimens according to the surface roughness of CFRP.
Highlights
The rapid development of technologies for exhaust pollution reduction in the automobile industry has been accompanied by a growing consumer demand for increased engine output and reduced fuel consumption
The as-received SPCC specimen was formed via cold rolling; its surface roughness value was dependent on the surface condition of the roller used during cold rolling
SPCC metallic materials with varying surface roughness were corroded, based on the potentiodynamic values obtained in the presence of a 5.0 wt.% NaCl aqueous solution
Summary
The rapid development of technologies for exhaust pollution reduction in the automobile industry has been accompanied by a growing consumer demand for increased engine output and reduced fuel consumption. Lightweight materials like Al, Mg, and carbon fiber reinforced plastic (CFRP) can help improve the fuel consumption of vehicles. These materials have already been commercialized as major alternative parts in high-end vehicles. The preference for lightweight vehicle parts has led to a demand for new materials that meet various consumer demands, including safety and convenience [1,2,3]. This study investigated lightweight CFRP materials and an automotive rolled mild steel alloy (known as SPCC). The microstructural and compositional changes after electrochemical evaluation were analyzed to establish the applicability of CFRP and SPCC as multi-materials in automotive parts [7,8,9,10]
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