scholarly journals Modification of surface layer in aluminum alloys by electroerosion coating

2016 ◽  
Vol 1 (4) ◽  
pp. 14-21
Author(s):  
А. Норман ◽  
A. Norman ◽  
В. Смоленцев ◽  
V. Smolentsev ◽  
В. Золотарев ◽  
...  
Keyword(s):  
Surface Layer ◽  
Aluminum Alloy ◽  
Cast Iron ◽  
Aluminum Alloys ◽  
Coating Process ◽  
Fusion Temperature ◽  
Friction Units ◽  
Antifriction Properties ◽  
Iron Coatings ◽  
Active Substances

The mechanism of plating on low-melting alloys (for example, aluminum) cast-iron coatings having a high fusion temperature is considered. By means of this method one achieves in light aluminum alloy parts higher performance attributes to which belong reliable protection of parts with a coating against aggressive influence of chemically active substances. Besides, antifriction properties of parts operating in friction units are improved. The technological modes are developed and a coating process is designed. The example of the method offered is shown.

Comparison of the Behaviour of Copper, Cast Iron and Aluminum Alloy Substrates Heated by a Plasma Transferred Arc

1998 ◽  
Author(s):  
M. Leylavergne ◽  
H. Valetoux ◽  
J.F. Coudert ◽  
P. Fauchais ◽  
V. Leroux
Keyword(s):  
Heat Flux ◽  
Aluminum Alloy ◽  
Cast Iron ◽  
Aluminum Alloys ◽  
Video Camera ◽  
Plasma Transferred Arc ◽  
Transferred Arc ◽  
Copper Aluminum ◽  
Set Up ◽  
Working Parameters

Abstract PTA (Plasma Transferred Arc) reclamation of aluminum alloys by hard materials with a much higher melting temperature is very difficult. This is due to the high thermal diffusivity of these al1oys. Below a critical heat flux ?c nothing happens and over ?c the substrate melts very rapidly contrarily to what is observed with steel substrates. That explains probably why PTA is mainly used for steel reclamation. Thus the knowledge of heat flux transferred to the anode is a critical point to develop PTA reclamation on aluminum alloys and this is the aim of this paper. An experimental set-up was built to study the heat transferred to three substrates made of different materials : cast iron for reference, aluminum alloy and copper for its high thermal conductivity. The plasma torch was a Castolin Eutectic gun and allowed to inject a sheath gas around the plasma column. The copper, aluminum alloy and cast iron substrates, easily interchangeable, were the top of a water-cooled calorimeter allowing to determine the variation of the received heat flux with the working parameters : arc current, stand off distance, plasma forming gas momentum, sheath gas composition and momentum. The determination of the arc electric field allowed to calculate the arc diameter which was compared first with pictures taken with a video camera and second, with wear traces left on the anode material. Several correlations have been established to characterize the arc voltage and the anode heat flux.

Characterization of Interfacial Microstructure of Cast Iron Inserts Dipping in Aluminum Alloy Melt

2021 ◽  
Vol 21 (3) ◽  
pp. 2010-2014
Author(s):  
Chan-Hyun Jung ◽  
Hyeon-Woo Son ◽  
Sang-Wook Kim ◽  
Jong-Kyun Kim ◽  
Byoung-Lok Jang ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Cast Iron ◽  
Aluminum Alloys ◽  
Impact Resistance ◽  
Void Formation ◽  
Interfacial Microstructure ◽  
Bonding Layer ◽  
Friction Resistance ◽  
Dipping Process ◽  
The Impact

Commercial vehicle pistons should have low thermal expansion and should be able to withstand deformation or mechanical stress. Aluminum alloys are suitable for pistons due to their light weight. However, as aluminum alloys have low strength and friction resistance, cast iron is added through the dipping process in order to increase the quality of pistons. However, the dipping process leads to defects such as defective bonding, void formation, and formation of an oxidation film at the junctions of the two materials due to differences in their properties, which adversely affects the impact resistance and mechanical strength of the product. A theoretical study on the metallurgical bond between the aluminum alloy and the cast iron insert in the piston was conducted to investigate the cause of the defects. The microstructure of the intermetallic bonding layer was observed using scanning electron microscopy and electron dispersive spectroscopy. In this study, defects were found in non-bonding and oxide films and several phases were generated corresponding to different parameters. It was found that processing time and temperature were the main causes of these defects.

Corrosion performance of plasma-sprayed cast iron coatings on aluminum alloy for automotive components

2005 ◽  
Vol 200 (1-4) ◽  
pp. 1162-1167 ◽  
Author(s):  
W.J. Kim ◽  
S.H. Ahn ◽  
H.G. Kim ◽  
J.G. Kim ◽  
Ismail Ozdemir ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Cast Iron ◽  
Corrosion Performance ◽  
Automotive Components ◽  
Plasma Sprayed ◽  
Iron Coatings

scholarly journals Electroerosion formation and technology of cast iron coatings on aluminum alloys

2017 ◽  
Vol 129 ◽  
pp. 01016 ◽  
Author(s):  
Vladislav P. Smolentsev ◽  
Oleg N. Fedonin ◽  
Eugene V. Smolentsev
Keyword(s):  
Cast Iron ◽  
Aluminum Alloys ◽  
Iron Coatings

scholarly journals Surface Modification of Aluminum 6061-O Alloy by Plasma Electrolytic Oxidation to Improve Corrosion Resistance Properties

Coatings ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 4
Author(s):  
Dmitry V. Dzhurinskiy ◽  
Stanislav S. Dautov ◽  
Petr G. Shornikov ◽  
Iskander Sh. Akhatov
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Plasma Electrolytic Oxidation ◽  
Electrochemical Impedance ◽  
High Strength ◽  
Electrolytic Oxidation ◽  
Coating Layers ◽  
Plasma Electrolytic ◽  
High Strength Aluminum Alloys

In the present investigation, the plasma electrolytic oxidation (PEO) process was employed to form aluminum oxide coating layers to enhance corrosion resistance properties of high-strength aluminum alloys. The formed protective coating layers were examined by means of scanning electron microscopy (SEM) and characterized by several electrochemical techniques, including open circuit potential (OCP), linear potentiodynamic polarization (LP) and electrochemical impedance spectroscopy (EIS). The results were reported in comparison with the bare 6061-O aluminum alloy to determine the corrosion performance of the coated 6061-O alloy. The PEO-treated aluminum alloy showed substantially higher corrosion resistance in comparison with the untreated substrate material. A relationship was found between the coating formation stage, process parameters and the thickness of the oxide-formed layers, which has a measurable influence on enhancing corrosion resistance properties. This study demonstrates promising results of utilizing PEO process to enhance corrosion resistance properties of high-strength aluminum alloys and could be recommended as a method used in industrial applications.

The Mechanical Behavior of Aluminium Alloy Quenching Process

2011 ◽  
Vol 228-229 ◽  
pp. 822-827
Author(s):  
Jia Yuan Luo ◽  
Rong Fan ◽  
Cheng Xiang Shi
Keyword(s):  
Surface Layer ◽  
Aluminum Alloy ◽  
Dynamic Simulation ◽  
Strain Field ◽  
Method Development ◽  
Experimental Tests ◽  
Analysis Method ◽  
Process Dynamic ◽  
Quenching Process ◽  
History Of

Since the aluminum alloy quenching is a complicated and a prompt heat-pressure coupling processing, traditional experimental tests and empirical judgments cannot explain and predict the physical and the force behavior completely during the quenching process. Dynamic simulation of the quenching process is conducted using the finite analysis method. Development laws of the stress and the strain field of the surface layer and core of the alloy during the quenching process are described based on the verification of the simulation. States and process history of the stress and the strain in each phase during the quench are obtained, which provides ponderable data and theoretical value for a fully understanding of the aluminum alloy quenching.

The Effect of Heat Treatments and Nickel Additive on The Microstructure and Hardness of 7075 Aluminum Alloy

2019 ◽  
Vol 7 (2) ◽  
pp. 34-41
Author(s):  
Mahmoud Alasad ◽  
Mohamad Yahya Nefawy
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Artificial Aging ◽  
Heat Treatments ◽  
7075 Aluminum Alloy ◽  
Nickel Additive

The aluminum alloys of the 7xxx series consist of Al with Zn mainly, Mg and Cu. 7xxx aluminum alloys has high mechanical properties making it distinct from other aluminum alloys. In this paper, we examine the effect of adding Nickel and heat treatments on the microstructure and hardness of the 7075 aluminum alloy. Were we added different percentages of nickel [0.1, 0.5, 1] wt% to 7075 Aluminum alloy, and applied various heat treatments (artificial aging T6 and Retrogression and re-aging RRA) on the 7075 alloys that Containing nickel. By applying RRA treatment, we obtained better results than the results obtained by applying T6 treatment, and we obtained the high values of hardness and a smoother microstructure for the studied alloys by the addition of (0.5 wt%) nickel to alloy 7075.

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