scholarly journals Increasing Hardness and Corrosion Resistance of Medium-Carbon Steel Surface by Cathodic Plasma Electrolytic Nitriding

2021 ◽  
Vol 57 (5) ◽  
pp. 27-33
Author(s):  
S.A. Kusmanov ◽  
◽  
I.V., Tambovsky ◽  
S.S. Korableva ◽  
S.A. Silkin ◽  
...  
Keyword(s):  
High Temperature ◽  
Carbon Steel ◽  
High Temperature Oxidation ◽  
Steel Surface ◽  
Medium Carbon Steel ◽  
Surface Erosion ◽  
Temperature Oxidation ◽  
Medium Carbon ◽  
Cathodic Plasma ◽  
Plasma Electrolytic

The structural-phase composition and some properties of medium-carbon steel modified surface after cathodic plasma electrolytic nitriding in a solution of ammonium chloride and ammonia have been studied. It is shown that cathodic nitriding of a steel surface is accompanied by high-temperature oxidation with the formation of oxides FeO, Fe2O3, and Fe3O4, as well as nitrogen diffusion and quenching with the formation of FeN, Fe3N, and Fe4N phases, martensite and the retained austenite. The competing effect of surface erosion by the actions of discharges and high-temperature oxidation on the morphology and roughness of the surface was revealed. It was established that the maximum microhardness of the modified layer reaches 1040 HV, and the corrosion current density of the nitrided surface decreases by a factor of 1.5–2.4.

scholarly journals Cathodic boriding and anodic polishing of medium-carbon steel by plasma electrolysis

2021 ◽  
Vol 2144 (1) ◽  
pp. 012027
Author(s):  
S S Korableva ◽  
I R Palenov ◽  
I M Naumov ◽  
A A Smirnov ◽  
I A Kusmanova ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Carbon Steel ◽  
Sulfate Solution ◽  
Medium Carbon Steel ◽  
Operating Voltage ◽  
Medium Carbon ◽  
Plasma Electrolysis ◽  
Electrolytic Polishing ◽  
Cathodic Plasma ◽  
Plasma Electrolytic

Abstract The possibility of cathodic plasma electrolytic boriding of medium-carbon steel in an aqueous solution of ammonium chloride and boric acid followed by anodic plasma electrolytic polishing in an ammonium sulfate solution on the same equipment with a change in the operating voltage is shown. The morphology and roughness of the surface, microhardness of the modified layer have been investigated. Wear resistance was studied under dry friction conditions. It has been established that cathodic boriding at 850 °C for 5–30 min leads to the hardening of the surface layer up to 1050 HV with an increase in roughness by 1.5–2.5 times and wear resistance by 3.5 times. Subsequent anodic plasma electrolytic polishing of the boriding surface leads to a decrease in roughness with an increase in wear resistance by 2.3 times.

High Temperature Oxidation Behaviors of Ni-Cr Based Thermal Sprayed Coatings

2009 ◽  
Vol 79-82 ◽  
pp. 691-694
Author(s):  
Liu Ying Wang ◽  
Gu Liu ◽  
Yong Fa Wu ◽  
Shao Chun Hua ◽  
Jian Xun Yao
Keyword(s):  
High Temperature ◽  
Carbon Steel ◽  
High Temperature Oxidation ◽  
Steel Substrate ◽  
Medium Carbon Steel ◽  
Arc Spraying ◽  
Gravimetric Analysis ◽  
Temperature Oxidation ◽  
Cr Coating ◽  
Oxidation Behaviors

Ni-Cr coating and Ni-Cr/ZrO2 gradated coating were deposited on C45 carbon steel by high velocity arc spraying and micro-plasma spraying to solve the high temperature oxidation problem of medium carbon steel components. The oxidations of Ni-Cr coating, Ni-Cr/ZrO2 gradated coating and C45 carbon steel substrate were carried out for up to 108 hours in air atmosphere at 1100°C. The oxidation behaviors were investigated after detailed examinations by thermal gravimetric analysis (TGA), x-ray diffraction (XRD) and scanning electron microscopy (SEM). Ni-Cr coating and Ni-Cr/ZrO2 gradated coating show similar and low dynamics curve near to the logarithms function. Surface observations with SEM and XRD reveal that the oxidizing surface of the C45 carbon steel substrate is mainly a loose spherical structure consisted of mainly Fe2O3 and Fe3O4. The surface structures of Ni-Cr coating and Ni-Cr/ZrO2 gradated coating after 108 hours oxidization are rather denser than that of C45 carbon steel, which can effectively improve the properties of the oxidation resistance of C45 carbon steel substrate.

High-temperature oxidation of Q235 low-carbon steel treated by plasma electrolytic borocarburizing

2015 ◽  
Vol 269 ◽  
pp. 302-307 ◽  
Author(s):  
Bin Wang ◽  
Jie Wu ◽  
Yifan Zhang ◽  
Zhenglong Wu ◽  
Yongliang Li ◽  
...  
Keyword(s):  
High Temperature ◽  
Carbon Steel ◽  
High Temperature Oxidation ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Temperature Oxidation ◽  
Plasma Electrolytic

High-Temperature Oxidation Resistance of Electroless Ni-P-ZrO2 Composite Coatings

2011 ◽  
Vol 686 ◽  
pp. 569-573 ◽  
Author(s):  
Ming Feng Tan ◽  
Wan Chang Sun ◽  
Lei Zhang ◽  
Quan Zhou ◽  
Jin Ding
Keyword(s):  
High Temperature ◽  
Carbon Steel ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Low Carbon ◽  
Temperature Oxidation ◽  
P Matrix ◽  
Electroless Ni

Electroless Ni-P coating containing ZrO2particles was successfully co-deposited on low carbon steel substrate. The surface and cross-sectional micrographs of the composite coatings were observed with scanning electron microscopy (SEM). And the chemical composition of the coating was analyzed with energy dispersive spectroscopy (EDS). The oxidation resistance was evaluated by weight gains during high temperature oxidation test. The results showed that the embedded ZrO2particles with irregular shape uniformly distributed in the entire Ni-P matrix, and the coating showed a good adhesion to the substrate. The weight gain curves of Ni-P-ZrO2composite coatings and Ni-P coating at 923K oxidation experiments were in accordance with . The ZrO2particles in Ni-P matrix could significantly enhance the high temperature oxidation resistance of the carbon steel substrate as compared to pure Ni-P coating.

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

High Temperature Oxidation Behavior of (Ti, Al) C Ceramic Coatings on Carbon Steel Prepared by Electrical Discharge Coating in Kerosene

2011 ◽  
Vol 189-193 ◽  
pp. 186-192 ◽  
Author(s):  
Guo Liang Li ◽  
Xiao Hua Jie ◽  
Ling He
Keyword(s):  
High Temperature ◽  
Carbon Steel ◽  
Electrical Discharge ◽  
High Temperature Oxidation ◽  
Ceramic Coating ◽  
Ceramic Coatings ◽  
Compact Structure ◽  
Temperature Oxidation ◽  
Before And After ◽  
High Temperature Oxidation Behavior

Multi-component metal ceramic coating（Ti, Al）C was prepared on the 0.45% carbon steel by electrical discharge coating (EDC) in a hydrocarbon medium. The coating of the samples before and after oxidation was analyzed by different methods including X-ray diffraction (XRD), scanning electron spectroscopy (SEM) and energy disperse spectroscopy (EDS).The thermogravimetric technique was used to approximate the kinetics of oxidation of the coated and the uncoated samples.The results indicated that the thickness of the coating was about 20μm, and the composition of the ceramic coating mainly consisted of (Ti, Al) C and a little Ti3AlC. An oxide film with compact structure formed after 600°C oxidation for 200h, and it was mainly composed of Al2O3and TiO2, which inhibited further oxygen diffusion into the coating. The (Ti, Al) C ceramic coating possessed slow oxidation rate and high temperature oxidation resistance.

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