scholarly journals Effect of Arc Currents on the Mechanical, High Temperature Oxidation and Corrosion Properties of CrSiN Nanocomposite Coatings

Coatings ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 40
Author(s):  
Yanxiong Xiang ◽  
Changwei Zou
Keyword(s):  
High Temperature ◽  
Friction Force ◽  
High Temperature Oxidation ◽  
Nanocomposite Coatings ◽  
Corrosion Properties ◽  
Temperature Oxidation ◽  
Polarization Impedance ◽  
Large Particles ◽  
Arc Current ◽  
Oxidation And Corrosion

In methods for multi-arc ion plating technology, the behavior and characteristics of the arc spot determine the physical characteristics of arc plasma and the properties of the subsequent deposited coatings. In this paper, the effect of arc currents on the hardness, friction coefficient, high temperature oxidation, and corrosion properties of the CrSiN coatings was studied. According to the XRD and SEM results, with the increase of arc currents, the coatings grew preferentially to the CrN (111) crystal direction, and the CrN (220) crystal phase appeared at high currents of 90 A. In addition, the number of large particles increased when the current exceeded 70 A. The HR-TEM results confirmed the formation of nanocomposite structure of nanocrystalline of CrN embedded into the amorphous phase of Si3N4 as explored by XRD. The maximum hardness was achieved at 3120 Hv when the coatings were deposited under currents around 70 A. However, the hardness values decreased with further increase of arc currents. From the contact of ceramic balls with the wear of coatings, the surface of coatings gradually produced friction marks, and the friction force increased from a steady friction force to a dynamic friction force. The high temperature oxidation results showed that fewer oxides were formed on the surface of the coatings when oxidized at 800 °C. It was also found that CrSiN nanocomposite coatings prepared at an arc current of 70 A had a larger corrosion potential and polarization impedance, which could effectively protect the tool matrix.

scholarly journals Influence of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Ni-Based Aluminide Coating in Na2SO4 Salt at 1050°C

2021 ◽  
Vol 8 ◽  
Author(s):  
Qing Li ◽  
Defeng Zhang ◽  
Peng Song ◽  
Zhenhua Li ◽  
Ruixiong Zhai ◽  
...  
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Oxide Scale ◽  
Hot Corrosion ◽  
Corrosion Test ◽  
High Temperature Oxidation ◽  
Aluminide Coating ◽  
Corrosion Properties ◽  
Temperature Oxidation ◽  
Oxidation And Corrosion

Aluminide coating is prepared on K438 Ni-based superalloy by pack cementation. The hot corrosion test of as-received and pre-oxidation aluminide coating in Na2SO4 salt are carried out at 1050°C. The coating morphologies, phase composition, and corrosion products are characterized by XRD, SEM, EDS, and TEM. The conclusion is that the pre-oxidation aluminide coating has excellent hot corrosion properties. After hot corrosion, the oxide scale of pre-oxidation aluminide coating is the thinnest and maintains good integrity. However, the oxide scale of as-received aluminide coating fluctuates greatly and there are corrosion cavities. CrS is formed in the alloy immediately below the oxide scale for the two coating systems.

scholarly journals High Temperature Oxidation and Corrosion Properties of High Entropy Superalloys

Entropy ◽  
2016 ◽  
Vol 18 (2) ◽  
pp. 62 ◽  
Author(s):  
Te-Kang Tsao ◽  
An-Chou Yeh ◽  
Chen-Ming Kuo ◽  
Hideyuki Murakami
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Corrosion Properties ◽  
Temperature Oxidation ◽  
High Entropy ◽  
Oxidation And Corrosion

Carbide Fragmentation and Dissolution in a High-Carbon High-Chromium Steel Using Hot Rolling Process: Microstructure Evolution, Wear, High-Temperature Oxidation, and Chloride-Induced Corrosion Properties

CORROSION ◽  
10.5006/2749 ◽  
2018 ◽  
Vol 74 (9) ◽  
pp. 958-970 ◽  
Author(s):  
Majid Shahsanaei ◽  
Sadegh Pour-Ali ◽  
Ali-Reza Kiani-Rashid ◽  
Sannakaisa Virtanen
Keyword(s):  
High Temperature ◽  
Corrosion Behavior ◽  
Hot Rolling ◽  
High Temperature Oxidation ◽  
Rolling Process ◽  
High Carbon ◽  
Corrosion Properties ◽  
Temperature Oxidation ◽  
High Chromium ◽  
Hot Rolling Process

A series of hot rolling processes with different reduction percentages (10%, 30%, and 50%) were applied to a high-carbon high-chromium tool steel (2HCTS). Microstructural evolutions, wear behavior, high-temperature oxidation, and aqueous corrosion properties were investigated. The results revealed the breakage and dissolution of primary carbides and a uniform carbide distribution after the hot rolling process. It was proposed that the presence of higher amounts of dissolved chromium in the hot rolled samples leads to the formation of Cr-rich oxides with more protection and less porosity at high temperatures, as well as an improved corrosion behavior in 3.5 wt% NaCl solution. This improvement in the corrosion behavior is not at the expense of the degradation of wear resistance. Probable mechanisms for carbides dissolution are also discussed.

scholarly journals High temperature oxidation and corrosion of spark plasma sintered FeCrAlTiY-10 mass% MoSi2 coating on low carbon steel

2020 ◽  
Author(s):  
Januaris Pane ◽  
Dedi Holden Simbolon ◽  
Bambang Hermanto ◽  
Kerista Sebayang ◽  
Marhaposan Situmorang ◽  
...  
Keyword(s):  
High Temperature ◽  
Carbon Steel ◽  
High Temperature Oxidation ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Temperature Oxidation ◽  
Spark Plasma ◽  
Mosi2 Coating ◽  
Oxidation And Corrosion

Synthesis of Ni-CeO2 Nanocomposite Coatings by Electroforming

2012 ◽  
Vol 248 ◽  
pp. 48-53
Author(s):  
Ning Song Qu
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Weight Percent ◽  
Ceo2 Nanoparticles ◽  
Nano Particles ◽  
Nanocomposite Coatings ◽  
Temperature Oxidation ◽  
Nickel Coatings

In this paper, the effect of CeO2 nanoparticles content in the bath on the weight percent of CeO2 particles, morphology, texture, and high temperature oxidation resistance of the nanocomposite coatings was examined. With a rise in the loadings of CeO2 particles in the bath from 10 gl-1 to 40 gl-1, the CeO2 particles weight percent in the nanocomposite coatings gradually increases. Further increased the loadings of particles in the bath to 50 gl-1, the weight percent reversely reduces. The maximum of CeO2 nano particles weight percent in the nanocomposite coatings is 4.98 wt% obtained at current density of 3 Adm-2 from the bath containing 40 gl-1 CeO2 particles. The high temperature oxidation resistance of Ni-CeO2 nanocomposite coatings significantly rise compared with that of bare nickel coatings, and enhanced with a rise in the loadings of CeO2 nano particles from 10 gl-1 to 30 gl-1. The wear resistance of deposits is also consist with the nanoparticles content in the bath。

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