Pulsed plasma nitriding of high velocity oxy-fuel sprayed Inconel 625 coatings

2021 ◽  
pp. 135065012110625
Author(s):  
Harun Mindivan
Keyword(s):  
Corrosion Resistance ◽  
Friction Coefficient ◽  
High Velocity ◽  
Constant Pressure ◽  
Plasma Nitriding ◽  
Inconel 625 ◽  
Pulsed Plasma ◽  
Nacl Solution ◽  
Excellent Corrosion Resistance ◽  
Gas Ratio

A hardening of high velocity oxy-fuel sprayed Inconel 625 coating systems was performed by pulsed plasma nitriding treatment. After deposition of an Inconel 625 coating, samples were pulsed plasma nitrided at 520 °C for 12 h in a gas ratio of 3:1 N2 and H2 under a constant pressure of 2.5 × 102 Pa. Pulsed plasma nitriding improved the microhardness of the high velocity oxy-fuel sprayed Inconel 625 coating from 355 to 401 HV0.05. The high velocity oxy-fuel-sprayed Inconel 625 coating after pulsed plasma nitriding process showed excellent corrosion resistance as well as a reduction of both the friction coefficient and wear rate during the sliding phase in a 3.5 wt.% NaCl solution against sliding action of Al2O3 ball.

Corrosion characteristics of plasma spray, arc spray, high velocity oxygen fuel, and diamond jet coated 30MnB5 boron alloyed steel in 3.5 wt.% NaCl solution

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Bekir Güney ◽  
Yusuf Dilay ◽  
Moses M. Solomon ◽  
Hüsnü Gerengi ◽  
Adem Özkan ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Plasma Spray ◽  
High Velocity ◽  
Electrochemical Impedance ◽  
Iron Carbide ◽  
Alloyed Steel ◽  
Coated Sample ◽  
Nacl Solution ◽  
Arc Spray ◽  
Coated Surfaces

Abstract 30MnB5 boron alloyed steel surface is coated using different coating techniques, namely 60(Ni-15Cr-4.4Si-3.5Fe-3.2B 0.7C)-40(WC 12Co) metallic powder plasma spray, Fe-28Cr-5C-1Mn alloy wire arc spray, WC-10Co-4Cr (thick) powder high velocity oxy-fuel (HVOF), and WC-10Co-4Cr (fine) diamond jet HVOF. The microstructure of the crude steel sample consists of ferrite and pearlite matrices and iron carbide structures. The intermediate binders are well bonded to the substrate for all coated surfaces. The arc spray coated surface shows the formation of lamellae. The cross-section of HVOF and diamond jet HVOF coated surfaces indicates the formation of WC, W2C Cr, and W parent matrix carbide structures. The corrosion characteristic of the coated steel has been investigated in 3.5 wt.% NaCl solution using electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDAX) techniques. The results reveal that the steel corroded in the medium despite the coatings. However, the extent of corrosion varies. HVOF coated sample demonstrated the highest corrosion resistance while arc spray coated sample exhibited the least. EDAX mapping reveals that the elements in the coatings corroded in the order of their standard electrode potential (SEP). Higher corrosion resistance of HVOF coated sample is linked to the low SEP of tungsten.

scholarly journals Studies on the Corrosion Resistance of Laser-Welded Inconel 600 and Inconel 625 Nickel-Based Superalloys

2017 ◽  
Vol 62 (2) ◽  
pp. 653-656 ◽  
Author(s):  
K. Łyczkowska ◽  
J. Michalska
Keyword(s):  
Corrosion Resistance ◽  
Base Metal ◽  
Pitting Corrosion ◽  
Electrochemical Corrosion ◽  
Inconel 625 ◽  
Nacl Solution ◽  
Corrosion Tests ◽  
Inconel 600 ◽  
Good Corrosion Resistance

Abstract The paper presents the results of the electrochemical corrosion tests of Inconel 600 and Inconel 625 laser-welded superalloys. The studies were conducted in order to assess the resistance to general and pitting corrosion in 3.5% NaCl solution. It was found that Inconel 600 possesses good corrosion resistance, however Inconel 625 is characterized by a greater resistance to general and also to pitting corrosion of the weld as well as the base metal.

Electrochemical Behavior of Corrosion Resistance Alloys

2011 ◽  
Vol 418-420 ◽  
pp. 1097-1101 ◽  
Author(s):  
Tao Zhang ◽  
Hong Yang Jing ◽  
Yong Dian Han ◽  
Lian Yong Xu
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Ambient Temperature ◽  
Electrochemical Behavior ◽  
Electrochemical Impedance ◽  
Inconel 625 ◽  
Nacl Solution ◽  
Nyquist Plots ◽  
Potentiodynamic Polarisation

The electrochemical behavior of corrosion resistance alloys (316L SS, 2205 DSS and Inconel 625) was carried out at ambient temperature in 3.5% NaCl solution using potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS) techniques. Some significant characterization parameters such as Ecorr, Eb, Icorrand △E in polarisation curves were analyzed and compared to reveal the corrosion resistance of corrosion resistance alloys. The ZsimpWin software was utilized to discuss the Nyquist plots of various corrosion resistance alloys. The result shows that the corrosion resistance of the corrosion resistance alloys in 3.5% NaCl solution at ambient temperature follows the sequence: Inconel 625> 2205 DSS > 316L SS.

Fabrication of Zr55Al10Ni5Cu30 Amorphous Composite Coating on Plain Carbon Steel by Laser Cladding and Remelting

2013 ◽  
Vol 745-746 ◽  
pp. 746-753 ◽  
Author(s):  
Gao Zhi Jia ◽  
Wen Xian Wang ◽  
Xu Liu ◽  
Ze Qin Cui ◽  
Bing She Xu
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Composite Coating ◽  
Amorphous Phase ◽  
Laser Cladding ◽  
Plain Carbon Steel ◽  
Nacl Solution ◽  
Depth Direction ◽  
Excellent Corrosion Resistance ◽  
Polarization Studies

A Zr-based amorphous composite coating was fabricated by laser cladding and remelting on plain carbon steel. The amorphous phase contents of coatings were tailored by controlling the power density. The effect of amorphous phase content along the depth direction on the microhardness and corrosion resistance of the coating was studied. The results showed that the content of amorphous phase significantly decreased from the remelted layer to the cladded layer. In addition, it was found that the maximum microhardness of the coating were about 1061 HV0.1, observed 200 μm beneath the surface. Potentiodynamic polarization studies in 3.56 wt.% NaCl solution indicated that the remelted layer exhibited excellent corrosion resistance due to the high amount of amorphous phase.

scholarly journals Investigation of formation of hardened layer on titanium alloys by the method of ion-plasma nitriding

2019 ◽  
Vol 64 (1) ◽  
pp. 25-34
Author(s):  
I. L. Pobol ◽  
I. G. Oleshuk ◽  
A. N. Drobov ◽  
Sun Feng ◽  
Wang Lin
Keyword(s):  
Corrosion Resistance ◽  
Friction Coefficient ◽  
Titanium Alloys ◽  
Plasma Nitriding ◽  
Nitrided Layer ◽  
Saturation Pressure ◽  
Hardened Layer ◽  
Technological Parameters ◽  
Ion Plasma ◽  
Increase Wear Resistance

 Various methods are applied in the world practice to increase wear resistance, fatigue strength and corrosion resistance of aviation equipment, machinery and medicine parts made of titanium and its alloys. Ion-plasma nitriding provides the ultimate effect making it possible to obtain hardened layers with hardness of HV0.01 650–1000 with a thickness of 0.07–0.20 mm for 3–6 hours, depending on the grade of the titanium alloy.Technological factors effecting on the efficiency of ion-plasma nitriding of materials are the process temperature, duration of saturation, pressure, composition and flow rate of the working gas mixture. The effect of these technological parameters on the microstructure, microhardness and depth of hardened layers is investigated in the work. It is shown that hardness and depth of the nitrided layer can be controlled by changing the composition, volume and periodicity of the gaseous medium (nitrogen and argon) supply at the stages of heating and holding time of the samples from titanium and its alloys under ion-plasma nitriding. The tribological characteristics of titanium alloys as-received and the same ones subjected to ion-plasma nitriding under friction conditions without a lubricant were studied. For VT1-0 and VT6 alloys in the as-received state during the tests there is a monotonous decrease of the friction coefficient from 0.35–0.40 to 0.25, after nitriding the friction coefficient monotonically increases from 0.14 up to 0.30 when removing the hardened layer.Studies of corrosion resistance of titanium VT1-0, carried out in a 10 % solution of sulfuric acid, showed that after ion-plasma nitriding at a temperature of 830 °C for 6 hours, the corrosion resistance increases, as the positive polarization potential of the sample shows.

COPPER ALLOY No. 954

Alloy Digest ◽  
1975 ◽  
Vol 24 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Copper Alloy ◽  
Iron Alloy ◽  
High Strength ◽  
Heat Treating ◽  
Good Resistance ◽  
Excellent Corrosion Resistance ◽  
Aluminum Iron ◽  
Copper Aluminum

Abstract Copper Alloy No. 954 is a copper-aluminum-iron alloy characterized by high strength and hardness, good resistance to fatigue and wear, and excellent corrosion resistance. It is suited for service up to 750 F. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Cu-292. Producer or source: Copper alloy foundries.

MUELLER ALLOY 3140

Alloy Digest ◽  
1983 ◽  
Vol 32 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
Heat Treating ◽  
Lead Content ◽  
Atmospheric Conditions ◽  
Excellent Corrosion Resistance ◽  
High Copper ◽  
Screw Machine

Abstract MUELLER Alloy 3140 is a high-copper alloy with moderate strength, a rich bronze color and excellent corrosion resistance. Its lead content gives it excellent machinability which makes it suitable for screw-machine applications. Its uses include many screw-machine products, decorative hardware, pickling crates and parts to resist severe atmospheric conditions. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-451. Producer or source: Mueller Brass Company.

REVERE No. 430

Alloy Digest ◽  
1958 ◽  
Vol 7 (5) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
High Temperature ◽  
Physical Properties ◽  
High Resistance ◽  
High Strength ◽  
Heat Treating ◽  
Aluminum Bronze ◽  
Temperature Performance ◽  
Excellent Corrosion Resistance

Abstract REVERE No. 430 is an aluminum bronze having high strength, excellent corrosion resistance, and high resistance to sulfuric acid. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-63. Producer or source: Revere Copper and Brass Inc..

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