Journal of Metals, Materials and Minerals

Publication Date



The corrosion behavior of uncoated and CrN-coated onto AISI 4140 steel was studied by electrochemical technique. Firstly, the AISI 4140 steel samples were solution heat treated and oil quenched in order to achieve proper hardness. Then, they were surface-prepared with alteration of surface roughness by using SiC paper at different numbers of 180, 600, and 1200 prior to CrN coating. The samples were coated with CrN film by physical vapor deposition (PVD) technique. The corrosion behavior of the uncoated and CrN-coated samples was studied in air-saturated 3.5 wt% NaCl solution at the pH values of 2, 7 and 10 at room temperature. Before and after corrosion testing, the surface of the uncoated and CrN-coated samples was characterized by scanning electron microscopy (SEM) with chemical composition analysis by energy dispersive X-rays (EDX).The results showed that the CrN-coated samples exhibited lower corrosion rate than the uncoated samples at all pH values. In addition, it was found that corrosion rate of the uncoated and CrNcoated samples significantly altered with the surface roughness of the substrate prior to coating. The finer surface roughness is, the more corrosion resistance is.

First Page


Last Page




To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.