Effects of polyvinylidene fluoride sealing on micro-arc oxidation coating of 7075 aluminum alloy

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
J. Li ◽  
R.G. Song ◽  
X. Qi ◽  
C. Wang ◽  
B. Jiang
Keyword(s):  
Aluminum Alloy ◽  
Polyvinylidene Fluoride ◽  
Microarc Oxidation ◽  
Pvdf Film ◽  
7075 Aluminum Alloy ◽  
Alloy Matrix ◽  
Content Type ◽  
Micro Arc Oxidation ◽  
Oxidation Technology ◽  
And Performance

Purpose The purpose of this is to study the effects of organic sealing on the structure and performance of the micro-arc oxidation (MAO) film of 7075 aluminum alloy. Design/methodology/approach The 7075 aluminum alloy was treated by micro-arc oxidation technology, then the MAO films were sealed by polyvinylidene fluoride (PVDF) solutions with different concentrations to forms a MAO/PVDF composite coating on the surface of the 7075 aluminum alloy matrix. Findings The results show that the MAO/PVDF film thickness increased to 24.8 um. When the PVDF concentration was 8 g/L, and the sealed film reached best corrosion resistance and wear resistance. Originality/value The effects of different concentrations of PVDF on microarc oxidation properties of 7075 aluminum alloy were studied.

Study on Scanning Micro-arc Oxidation Technology Applied to 2024 Aluminum Alloy

2013 ◽  
Vol 28 (4) ◽  
pp. 381-386
Author(s):  
Peng-Xiang LÜ ◽  
Dong-Bo WEI ◽  
Cheng-Bo GUO ◽  
Zhao-Long LI ◽  
Shi-Chun DI
Keyword(s):  
Aluminum Alloy ◽  
2024 Aluminum Alloy ◽  
Micro Arc Oxidation ◽  
Oxidation Technology

Effects of Al2O3 Nanoparticles on Microstructure and Performance of Ceramic Coatings by Micro-Arc Oxidation

2013 ◽  
Vol 537 ◽  
pp. 92-96
Author(s):  
Yu Jun Yin ◽  
Shu Hua Li ◽  
Da Wei Shen ◽  
Yuan Yuan Zu ◽  
Chang Zheng Qu
Keyword(s):  
Aluminum Alloy ◽  
Oxide Coating ◽  
Ceramic Coatings ◽  
Al2o3 Nanoparticles ◽  
Electrolytic Solution ◽  
Dense Ceramic ◽  
Micro Arc Oxidation ◽  
And Performance ◽  
Microstructure And Performance ◽  
Ceramic Oxide Coating

A dense ceramic oxide coating approximately 45 µm thick was prepared on a Ly12 aluminum alloy by micro-arc oxidation in an alkali-phosphate electrolytic solution. Coating thickness and surface roughness (Ra) were measured after the coating had been synthesized. The effects of Al2O3 Nanoparticles in electrolyte on phase composition, microstructure and microhardness of the micro-arc oxidation ceramic coatings on Ly12 aluminum alloy were investigated by means of XRD, SEM and hardness experimentation. The results show that the ceramic coatings become more dense and its microhardness increased by adding Al2O3 Nanoparticles in electrolyte. In addition, the roughness of the micro-arc oxidation ceramic coatings is obviously improved by addition of Al2O3 Nanoparticles.

scholarly journals Sub-Gram In-Plane Vibration-Driven Robot with Inclined Legs

Proceedings ◽  
2020 ◽  
Vol 64 (1) ◽  
pp. 7
Author(s):  
David Robles-Cuenca ◽  
Víctor Ruiz-Díez ◽  
José Luis Sánchez-Rojas ◽  
Jorge Hernando-García
Keyword(s):  
Polyvinylidene Fluoride ◽  
Pvdf Film ◽  
Plane Vibration ◽  
Flexible Materials ◽  
3D Printed ◽  
And Performance ◽  
Robot Platform

This document reports the design, fabrication and performance of miniaturized locomotion systems employing flexible materials and 3D printed legs. The movement of the system was achieved by the first extensional mode of vibration of the platform of the robot and the inclination of the supporting legs. The structures were manufactured using a 30-mm-long piezoelectric polyvinylidene fluoride (PVDF) film as the robot platform, with manually added legs fabricated by stereolithography (SLA). Several speed measurements were performed for samples of 1- and 2-mm-long legs, at an angle of inclination of 45° and 60° to the PVDF film. The system was able to exceed a speed of 1 BL/s (body-lengths per second) to 25 V.

Fatigue crack growth prediction of 7075 aluminum alloy based on the GMSVR model optimized by the artificial bee colony algorithm

2017 ◽  
Vol 34 (4) ◽  
pp. 1034-1053 ◽  
Author(s):  
Dalian Yang ◽  
Yilun Liu ◽  
Songbai Li ◽  
Jie Tao ◽  
Chi Liu ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Prediction Accuracy ◽  
Artificial Bee Colony ◽  
7075 Aluminum Alloy ◽  
Prediction Ability ◽  
Content Type ◽  
Abc Algorithm ◽  
Bee Colony

Purpose The aim of this paper is to solve the problem of low accuracy of traditional fatigue crack growth (FCG) prediction methods. Design/methodology/approach The GMSVR model was proposed by combining the grey modeling (GM) and the support vector regression (SVR). Meanwhile, the GMSVR model parameter optimal selection method based on the artificial bee colony (ABC) algorithm was presented. The FCG prediction of 7075 aluminum alloy under different conditions were taken as the study objects, and the performance of the genetic algorithm, the particle swarm optimization algorithm, the n-fold cross validation and the ABC algorithm were compared and analyzed. Findings The results show that the speed of the ABC algorithm is the fastest and the accuracy of the ABC algorithm is the highest too. The prediction performances of the GM (1, 1) model, the SVR model and the GMSVR model were compared, the results show that the GMSVR model has the best prediction ability, it can improve the FCG prediction accuracy of 7075 aluminum alloy greatly. Originality/value A new prediction model is proposed for FCG combined the non-equidistant grey model and the SVR model. Aiming at the problem of the model parameters are difficult to select, the GMSVR model parameter optimization method based on the ABC algorithm was presented. the results show that the GMSVR model has better prediction ability, which increase the FCG prediction accuracy of 7075 aluminum alloy greatly.

Effects of electrolyte system on the microstructure and properties of MAO ceramics coatings on 7050 high strength aluminum alloy

2019 ◽  
Vol 66 (6) ◽  
pp. 812-818
Author(s):  
Y. Zong ◽  
G.P. Cao ◽  
T.S. Hua ◽  
S.W. Cai ◽  
R.G. Song
Keyword(s):  
Aluminum Alloy ◽  
High Strength ◽  
Electrolyte System ◽  
Silicate System ◽  
Aluminate Solution ◽  
Content Type ◽  
High Strength Aluminum Alloy ◽  
Microstructure And Properties ◽  
Micro Arc Oxidation ◽  
Main Component

Purpose This paper aims to investigate the effects of different electrolyte systems on the properties of micro-arc oxidation coating on 7050 high strength aluminum alloy. Design/methodology/approach The coatings were prepared in silicate system with Na2SiO3 as main component, borate system with Na2B4O7 as main component and aluminate solution with Na2AlO2 as main salt, respectively. Findings The results show that the 7050 high strength aluminum alloy shows the best properties in silicate system. Originality/value This manuscript studied the crucial influence of different electrolyte systems on the microstructure and properties of the aluminum alloy micro-arc oxidation layer.

The Preparation and Performance of LC4 Aluminum Alloys Ceramic Coatings with Trace Loose Layer Treated by Micro-Arc Oxidation

2014 ◽  
Vol 528 ◽  
pp. 3-7
Author(s):  
Jun Zhao ◽  
Jian Jun Xi ◽  
Chun Ping Zhao ◽  
Yu Jia Sun
Keyword(s):  
Aluminum Alloy ◽  
Mechanical Characteristics ◽  
Mechanical Performance ◽  
Ceramic Coatings ◽  
X Ray ◽  
Micro Arc Oxidation ◽  
And Performance ◽  
High Temperature Erosion ◽  
Loose Layer ◽  
Performance Structure

LC4 aluminum alloy samples were treated by micro-arc oxidation (MAO) to produce trace loose layer film to improve the surface properties. The mechanical characteristics, high temperature erosion performance, structure and composition were investigated by strength tester, high flame erosion, scanning electron microscopy and energy-dispersive X-ray spectrometry. Compared to the untreated aluminum alloy, MAO coatings have good mechanical performance with tensile strength bigger than 18MPa and is intact with 20s heat ablation of 1900°C.

Study on the Preparation and Property of the Ceramic Film on the LY12 Aluminium Alloy

2011 ◽  
Vol 291-294 ◽  
pp. 223-227
Author(s):  
Xiao Wen Chen ◽  
De Fen Zhang
Keyword(s):  
Thin Film ◽  
Aluminum Alloy ◽  
Aluminium Alloy ◽  
Current Density ◽  
Microarc Oxidation ◽  
Ceramic Film ◽  
Potentiostatic Method ◽  
Ceramic Thin Film ◽  
Micro Arc Oxidation

The ceramic thin film on the surface of LY12 aluminum alloy were prepared by the method of the microarc oxidation. The appearance of film was observed by stereoscopic microscope, the thickness of film was tested used thickness tester and the corrosion resisting property of sample in solution of 3.5% NaCl was measured by potentiostatic method. The results show that the tightness of film is best when used 8A/ dm2for micro-arc oxidation, the hardness is increased with the increase of current density. The corrosion resisting property of ceramic film in solution of 3.5% NaCl used different current density is different, the corrosion resisting property of ceramic film is first increased and then decreased with the increase of current density, the corrosion resisting property of ceramic film prepared with the current density of 8A/ dm2is best.

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