Effects of Post-oxidizing Treatment on Melting Loss and Corrosion Resistance of Gas Nitrided AISI H13 Tool Steel

Abstract

This study conducted gas nitriding on AISI H13 steels, followed by oxidization treatments at various temperatures (560°C, 580°C, 600°C) and soaking times (1 h, 2 h, 3 h), to investigate the melting loss and corrosion resistance of A380 aluminum alloy. The experimental results indicated that the samples of oxynitriding (post-oxidizing treatment after nitrided) at 580°C for 3 h, 600°C for 2 h and 600°C for 3 h have better ability to resist melting loss due to their thicker oxidized layers. The weight loss rate also showed that they are near zero after a 4 h erosion test. The increasing weight loss rate is relative to the appearance of the FexAlySiz compound. In addition, the difference in corrosion current is closely related to the corrosion rate. A smaller corrosion current will lead to a smaller corrosion rate. As a result, increasing the temperature and soaking time of oxidization is advantageous to the corrosion resistance, and a small variation in corrosion current will result in a significant change to the polarization resistance of corrosion. Consequently, the oxide layer can enhance the polarization resistance, and quickly generate a passivation layer that increases the corrosion resistance ability.

Improvement of the Wear and Corrosion Behaviors of DLC/oxynitriding Duplex-treated PM60 High-speed Steel <i>via</i> Various Power Densities of DC-pulsed Plasma Enhanced CVD

“…2,3) Thus, the surface hardness and strength of the specimens were dramatically enhanced, as shown in Fig. 1(b).…”

“…The lowest wear loss volumes were 2.36 × 10 − 3 (2 N) and 5.67 × 10 − 3 mm 3 (5 N), respectively. As mentioned previously, as the power density of the DC-pulsed PECVD increased (over 400 mW·cm − 2 ), the ion bombardment energy rapidly increased, which resulted in the decrease in the stable sp 3 bonding. The results were ascribed to the poor bonding structure and lower hardness of the DLC films.…”

“…Significantly, the 400 mW·cm ). According to previous literature, 12) it is reasonable to suggest that with a power density of 400 mW·cm − 2 , the specimen possessed the more stable sp 3 bonding, which resulted in a better microstructure and mechanical properties.…”

“…The complex oxide layer with Fe 2 O 3 and Fe 3 O 4 structures are formed on the surface, improving the corrosion and erosion properties of the steel. [3][4][5] …”

“…3(a). The previous literature pointed out that when the power density was low, the surface structure had less sp 3 bonding, which resulted in the poor properties of the DLC films. 16,17) Conversely, 400 mW·cm − 2 and the other power densities belonged to the HF 1 grade, as shown Fig.…”