scholarly journals Ultrasonic irradiation and its application for improving the corrosion resistance of phosphate coatings on aluminum alloys

2010 ◽  
Vol 17 (1) ◽  
pp. 21-25 ◽  
Author(s):  
Minqi Sheng ◽  
Chao Wang ◽  
Qingdong Zhong ◽  
Yinyin Wei ◽  
Yi Wang
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloys ◽  
Ultrasonic Irradiation ◽  
Phosphate Coatings

Effect of Phosphating Technologies on Corrosion Resistance of Phosphate Coatings on 6063 Aluminum Alloy

2011 ◽  
Vol 399-401 ◽  
pp. 2079-2082
Author(s):  
Bi Lan Lin ◽  
Yu Ye Xu ◽  
Biao Tian
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Tafel Polarization ◽  
Phosphate Coatings ◽  
6063 Aluminum Alloy

The basic formulation and technologies of phosphating for 6063 aluminum alloys were discussed to enhance the corrosion resistance. The effect of phosphating time, pH, ZnO, H3PO4 and NaF content on corrosion resistance was investigated using Tafel polarization methods. The results show that the optimum phosphating technologies of 6063 aluminum alloys are as follows: 7 g/L ZnO, 20 mL/L 85% H3PO4, 1.2 g/L NaF, pH 3.0, temperature 45±2°C, phosphating time 7 min. After phosphating treatment the anodic and cathodic corrosion processes of 6063 alloys are suppressed greatly, and the corrosion resistance is enhanced.

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.

scholarly journals Effect of Microwave and Conventional Modes of Heating on Sintering Behavior, Microstructural Evolution and Mechanical Properties of Al-Cu-Mn Alloys

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3675
Author(s):  
A. Muthuchamy ◽  
Muthe Srikanth ◽  
Dinesh K. Agrawal ◽  
A. Raja Annamalai
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Aluminum Alloys ◽  
Sintered Sample ◽  
Sintering Behavior ◽  
Sintered Alloy ◽  
Conventional Radiation ◽  
Sintered Aluminum ◽  
Electron Microscopes ◽  
Mechanical Properties And Corrosion

In this research, we intended to examine the effect of heating mode on the densification, microstructure, mechanical properties, and corrosion resistance of sintered aluminum alloys. The compacts were sintered in conventional (radiation-heated) and microwave (2.45 GHz, multimode) sintering furnaces followed by aging. Detailed analysis of the final sintered aluminum alloys was done using optical and scanning electron microscopes. The observations revealed that the microwave sintered sample has a relatively finer microstructure compared to its conventionally sintered counterparts. The experimental results also show that microwave sintered alloy has the best mechanical properties over conventionally sintered compacts. Similarly, the microwave sintered samples showed better corrosion resistance than conventionally sintered ones.

scholarly journals Electroless Ni-P Film under Ultrasonic Irradiation and Its Corrosion Resistance.

1995 ◽  
Vol 46 (12) ◽  
pp. 1125-1129
Author(s):  
Atsushi CHIBA ◽  
Hidetomo KURAMITSU ◽  
Wen-Chang WU ◽  
Katsuyoshi KOBAYASHI
Keyword(s):  
Corrosion Resistance ◽  
Ultrasonic Irradiation ◽  
Electroless Ni

Effect of Rolling Parameters on the Properties of Al-Fe-V Sheet Rolled on an Experimental Mill

1985 ◽  
Vol 58 ◽  
Author(s):  
A. Brown ◽  
D. Raybould
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Aluminum Alloys ◽  
Room Temperature ◽  
Thermomechanical Processing ◽  
High Temperature Strength ◽  
Rapidly Solidified ◽  
Large Sheet ◽  
Room Temperature Strength

ABSTRACTIn recent years, interest in high temperature aluminum alloys has increased. However, nearly all the data available is for simple extrusions. This paper looks at the properties of sheet made from a rapidly solidified Al-10Fe-2.5V-2Si alloy. The sheet is made by direct forging followed by hot rolling, this is readily scalable, so allowing the production of large sheet. The room temperature strength and fracture toughness of the sheet are comparable to those of 2014-T6. The high temperature strength, specific stiffness and corrosion resistance are excellent. Recently, improved thermomechanical processing and new alloys have allowed higher strengths and fracture toughness values to be obtained.

Metallic Coatings for Brazing Aluminum Alloys

2019 ◽  
Author(s):  
A.A. Suslov
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloys ◽  
Oxide Film ◽  
Structural Materials ◽  
Contact Melting ◽  
Parent Material ◽  
Metallic Coatings ◽  
Specific Strength ◽  
High Specific Strength ◽  
Modern Engineering

Because of their high specific strength and satisfactory corrosion resistance, aluminum alloys belong to the group of fundamental structural materials in modern engineering. Their wide use has been made possible as a result of developing advanced methods of processing and producing permanent joints by welding or brazing. However, the application of brazing aluminum alloys is limited because of the problems in removing the strong and chemically resistant oxide film. These problems can be overcome by using metallic coatings which themselves do not oxidize during heating in vacuum and, when deposited, the oxide film is broken up and can be removed from the surface of the parent material. The most promising method is to use metallic coatings in the form of individual components of the brazing alloy which forms in contact melting of the deposited coatings with aluminum in heating for brazing. This brazing method is referred to as contact-reactive brazing and is used widely for brazing aluminum alloys. This article provides an overview of the contact-reactive brazing process.

scholarly journals Анализ скоростных зависимостей критических напряжений в алюминиевых сплавах системы Al-Mg при ударных нагрузках

2020 ◽  
Vol 62 (11) ◽  
pp. 1749
Author(s):  
А.Д. Евстифеев ◽  
И.В. Смирнов ◽  
Ю.В. Петров
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloys ◽  
Strain Rate ◽  
Slight Reduction ◽  
Dynamic Stresses ◽  
Good Ductility ◽  
Critical Stresses ◽  
Critical Dynamic ◽  
Strain Rate Loading ◽  
Alloys Of The Al

Aluminum alloys of the Al-Mg system are widely used in automotive and aviation industries due to their combination of strength, good ductility and corrosion resistance. Increasing the percentage of magnesium leads to higher strength of the material with a slight reduction of ductility. Behavior of critical stresses in materials were studied under variable strain rate loading conditions. The possibility to predict critical dynamic stresses of materials based on a structural-time approach is discussed.

Corrosion resistance of black phosphorus nanosheets composite phosphate coatings on Q235 steel

2020 ◽  
Vol 250 ◽  
pp. 123056 ◽  
Author(s):  
Mengzhe Wang ◽  
Ruina Ma ◽  
An Du ◽  
Shihao Hu ◽  
Mustafa Muhammad ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Black Phosphorus ◽  
Q235 Steel ◽  
Phosphate Coatings

scholarly journals Surface modification of Cr‒Mo steel by new technology using high speed jet in water under ultrasonic irradiation

2018 ◽  
Vol 207 ◽  
pp. 03023
Author(s):  
Masataka Ijiri ◽  
Toshihiko Yoshimura
Keyword(s):  
Residual Stress ◽  
Corrosion Resistance ◽  
Surface Modification ◽  
Ultrasonic Irradiation ◽  
High Speed ◽  
Processing Time ◽  
Compressive Residual Stress ◽  
New Technology ◽  
Ultrasonic Power ◽  
Processing Times

In this study, to further improve current multifunction cavitation (MFC) techniques, the surface modification of Cr‒Mo steel was further investigated using 1200 W ultrasonic power. In MFC using 1200 W ultrasonic power, the corrosion resistance, and compressive residual stress of the specimens were improved when the processing time was 10 min; however, decarburization occurred at longer processing times, causing these characteristics to worsen. The decarburization that occurs at high ultrasonic outputs may be caused by an increase in the water temperature, and of the heating of the specimen surface.

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