Abstract
Recently, consumer complaints on car corrosion have been steadily increasing. The main cause of corrosion is calcium chloride, which is commonly used in winter, and the lower parts of the car, such as suspension, are more affected by it. Corrosion affects the parts durability by weakening them and threatening the passenger safety if exposed to continuous loads. Therefore, herein, a method of improving corrosion performance was studied by applying the surface treatment to the welding part of the steel plate used in the manufacture of cross members among automobile suspension parts. Specimens were manufactured through brushing and the sand blasting surface treatment, and cross-cut adhesion tests and repeated corrosion tests were conducted. The test results showed that the cause of the electrodeposition coating and corrosion defects was the oxide layer formed from oxidation after welding, and the sand blasting surface treatment was very effective in removing the oxide layer.
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