Abstract
Workpiece will face corrosive problems during its application after the manufacturing process. As the common final process, grinding can generate special metamorphic layer on the surface of workpiece and change the initial corrosion resistance of workpiece. In order to study the corrosion resistance of workpiece after grinding process, the paper carries on combining experiment of grinding and electrochemical corrosion. The characteristic of corrosion resistance of grinding is revealed based on the association of grinding mechanism and electrochemical theory. The corrosion potential of workpiece after grinding is higher than matrix, which shows the grinding surface is difficult to begin to corrode. Electrochemical impedance spectroscopy (EIS) shows the grinding surface has large phase angle, impedance and capacitance characteristic because the metamorphic layer of grinding has good obstructive ability. They reveal that grinding improves the surface corrosion resistance of workpiece. Then the mechanism of the corrosion resistance of grinding is revealed. The special grain boundary formed in grinding with much C element, large clusters and complex shape prolongs the corrosion channel, which reduces the corrosive speed. While, the sensitive hardening structure generated in grinding hardening with much free energy is easy to form the corrosion cell, which will accelerate the corrosion.
Highlights
Workpiece will face corrosive problems during its application after the manufacturing process
Grinding is always the final procedure in the manufacturing process, which will decide the final characteristic of surface layer and its surface integrity of the workpiece
The surface of workpiece produces a special layer which is different from the inner part due to the coupling function of all the complex factors above. It can be called as the metamorphic layer and will determine the working performance of workpiece after g rinding[10,11,12,13], such as the tribology features, contacting fatigue properties and the corrosion resistance which is the target of the paper
Summary
Where whether Fe is easy to lose its electronic in Eq (1) is one of the factors of the corrosion resistance of grinding surface layer. As the previous analysis, grinding generates complex boundary of grain in the surface metamorphic layer of workpiece. In the situation the reaction of Eq (1) are easier to happen and the corrosion channel is easier to form, which results in the decrease of the corrosion resistance of the surface layer of grinding hardening. The corrosion products improve the resistant ability to the corrosive ion in the solution besides the corrosion resistance of grinding surface layer itself. The surface matrix has a high level of corrosion after the electrochemical corrosion
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