Deposition of DLC/oxynitriding Films onto JIS SKD11 Steel by Bipolar-pulsed PECVD

Deposition of DLC Films onto Oxynitriding-Treated V4E High Vanadium Tool Steel through DC-Pulsed PECVD Process

“…The samples with a lower current density (I corr ) and higher potential (E corr or polarization resistance R p ) evidenced better corrosion resistance. 10) ) and the lowest polarization resistance (192.54 Ω·cm 2 ). This result indicated that the 400 mW·cm −2 specimen had a relatively stable sp 3 /sp 2 bonding structure, which helped for improving the corrosion resistance.…”

“…Actually, the radial cracks did not result from fractures of the DLC lms, but were caused by the compressive stress on the specimen s surface from the oxynitriding process. Generally speaking, the adhesion strength of DLC lms on steel is poor 10) and adhesion-enhancing materials have been used directly as intermediate layers. In this work, the oxynitriding process used pre-treated V4E tool steel as an intermediate layer.…”

“…The wear test parameters were as follows: the specimen size was Ø36 × D5 mm, diameter of WC ball (HRA 90 ± 1) was 6 mm, disk rotation was 200 rpm and total rotation was 10,000 revolutions, axial load was 2 N and 5 N, and sliding speed of 0.25 m·s −1 , respectively. Additionally, corrosion potential analysis uses three electrodes method and follows by ASTM G59-97: the reference electrode is a saturated of silver-silver chloride electrode, auxiliary electrode uses a platinum electrode, and the working electrode is connected to the test specimens 10,13) The contact area of the specimen was 2.01 cm 2 . The corrosive solvent used 3.5 mass% NaCl was maintained at room temperature.…”

“…They have high surface hardness, a low friction coef cient, reduced material adhesion, and they offer high protection against abrasive wear and corrosive attacks. 9,10) However, the poor adhesion of DLC lms on ferrous alloys reduces a wide range of industrial applications. Because the carbon diffuses into the metals delaying the DLC nucleation.…”

Enhancement of the Wear and Corrosion Resistance of DLC/oxynitriding Duplex-treated PM30 Steel by the Asymmetric Bipolar-pulsed Plasma Enhanced CVD

“…It reveals an effective improvement of thermal fatigue characteristics due to the effects of compressive stress and the hardened surface. 7) The previous studies also indicated that oxygen addition can increase the efficiency of gas nitriding. 8) Oxynitriding processes use air or steam at the end of the nitriding stage, while the complex oxide layer with Fe 2 O 3 and Fe 3 O 4 structures are formed on the surface.…”