The Effect of Temperature on the Surface Chemistry of Aluminum Alloy P-Ni Alloy Plating Quality

2010 ◽  
Vol 146-147 ◽  
pp. 1655-1658
Author(s):  
Qing Hua Chang ◽  
Er Hui Zhi ◽  
Xu Ping Wu ◽  
Jian Han ◽  
Yan Fang Chen
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Practical Significance ◽  
Effect Of Temperature ◽  
Optimum Temperature ◽  
Chemical Plating ◽  
Ni Alloy ◽  
Alloy Plating ◽  
Scanning Electron

In aluminum alloy chemical plating process, temperature is one of the most important factors which directly affect the coating speed and quality. With the change of temperature with speed, so temperature is an important factor which affect the deposition speed. Therefore, to measure and study the influence on temperature to the quality of coating and plating speed is of important theoretical and practical significance. Using scanning electron observe the surface morphology of coating. Spectrum analyzer detects the surface content of Ni- P; then corrosion resistance of coating is detected, and thus the optimum temperature is determined.

scholarly journals Investigation on the Surface Properties of 5A12 Aluminum Alloy after Nd: YAG Laser Cleaning

Coatings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 578 ◽  
Author(s):  
Guodong Zhu ◽  
Shouren Wang ◽  
Wei Cheng ◽  
Gaoqi Wang ◽  
Wentao Liu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Laser Cleaning ◽  
Alloy Surface ◽  
Residual Tensile Stress ◽  
Yag Laser ◽  
Diode Pumped ◽  
Aluminum Alloy Surface ◽  
Diode Pumped Nd:Yag Laser

The surface of the aluminum alloy is prone to oxidation, which in turn affects the quality of the weld. The 5A12 aluminum alloy was cleaned by acousto-optic Q-switched diode-pumped Nd:YAG laser and the effects of different laser powers and different cleaning speeds on the surface roughness, microstructure, element content, microhardness, residual stress and corrosion resistance of aluminum alloy were investigated. The results show that when the power is 98W and the cleaning speed is 4.1 mm/s, the effect of Nd: YAG laser on the removal of oxide film on 5A12 aluminum alloy surface is the most effective. After laser cleaning, the smoothness and strength of aluminum alloy surface can be effectively improved. However, as a major element in 5A12 aluminum alloy, the content of magnesium decreased. At the same time, the residual tensile stress was generated on the surface of the aluminum alloy after cleaning, and the corrosion resistance slightly decreased.

Effects of graphene on the microstructure and properties of MAO coatings formed on AA7050

2020 ◽  
Vol 111 (6) ◽  
pp. 463-468
Author(s):  
Bo Xu ◽  
Yafeng He ◽  
Xiangzhi Wang ◽  
Weimin Gan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Composite Coatings ◽  
Ceramic Coatings ◽  
X Ray Diffraction ◽  
X Ray ◽  
Micro Arc Oxidation ◽  
Scanning Electron

Abstract Ceramic coatings were prepared on the surface of 7050 highstrength aluminum alloy using micro-arc oxidation in an aluminate electrolyte with added graphene. To analyze the surface morphology, roughness, phase composition, and corrosion resistance, scanning electron microscopy, X-ray diffraction, X-ray photoelectron, and electrochemical measurements were used, respectively. The addition of 9 g · L-1 of graphene to the electrolyte decreased the micro-pore size of the composite coatings and improved the density. In addition, with the addition of graphene, the roughness was the lowest, and the corrosion resistance was significantly improved.

scholarly journals Manufacturing, Microstructure and Corrosion Resistance of Electrophoretically Deposited SiO2 and Ni/SiO2 Coatings On X2CrNiMo17–12–2 Steel

2016 ◽  
Vol 61 (2) ◽  
pp. 1221-1227
Author(s):  
T. Ratajski ◽  
I. Kalemba-Rec ◽  
B. Dubiel
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Corrosion Resistance ◽  
Cross Sections ◽  
Deposition Time ◽  
Plan View ◽  
Uniform Microstructure ◽  
Scanning Electron

Abstract The SiO2 and Ni/SiO2 coatings were electrophoretically deposited on X2CrNiMo17-12-2 steel using ethanol-based suspensions of the SiO2 and Ni powders. The influence of the zeta potential and concentration of the suspensions, the applied voltage and deposition time on the quality of the coatings was studied. Microstructure of the plan-view and cross sections of the coatings was investigated using scanning electron microscopy. The plan-view images revealed the uniform microstructure of the coatings with sporadically observed cracks, pores as well SiO2 and Ni agglomerates. On the cross-sections, the Cr2O3 layer, resulted from oxidation of the substrate during sintering of the coatings was observed. The polarization tests have shown that SiO2 and Ni/SiO2 coatings improve the corrosion resistance of the X2CrNiMo17-12-2 steel in 3.5% NaCl aqueous solution.

INVESTIGATION OF SOME PROPERTIES OF ZINC-NICKEL ALLOY PLATING WITH TRIETHANOLAMINE, p-AMINOBENZENESULFONIC ACID, AND GELATINE

2020 ◽  
Vol 27 (12) ◽  
pp. 2050018
Author(s):  
AHMET OZAN GEZERMAN
Keyword(s):  
Corrosion Resistance ◽  
Nickel Alloy ◽  
Complexing Agent ◽  
X Ray ◽  
Ni Alloys ◽  
Ni Alloy ◽  
Alloy Plating ◽  
Zinc Nickel

Anticorrosion requirements for the metallurgy, automotive, and aeronautical industries have increased in recent years, for which alternative plating chemicals must be developed. This study focuses on obtaining a Zn-Ni alloy plating with higher corrosion resistance and brightness. For this purpose, tetraethylenepentaamine as complexing agent, triethanolamine as the surfactant, and gelatin and [Formula: see text]-aminobenzenesulfonic acid as brightening agents for the plating were selected and their optimal concentrations were determined for applications. The optimal Zn-Ni ratio and plating thickness were analyzed using an X-ray Dal device. Improved plating performance of the Zn-Ni alloys was achieved with a Zn-Ni alloy containing 12–14% Ni.

Preparation and Properties of Cerium Conversion Coatings on the Surface of Aluminum Alloy LY12

2012 ◽  
Vol 182-183 ◽  
pp. 241-244
Author(s):  
Cheng Bao Xia ◽  
Wen Jun Ge ◽  
Hou Chuan Yang
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Surface Modification ◽  
Aluminum Alloy ◽  
New Technology ◽  
Conversion Coating ◽  
Modification Technique ◽  
Resistance Performance ◽  
The Given

In order to improve the repairing quality of aircraft envelope of the aluminum alloy LY12， the cerium conversion coating technology was studied by using the surface modification technique. Principle experiment was on the basis of aviation repair technological requirement, refers to the related technique, through examination of corrosion resistance and wear resistance performance of cerium conversion coating, the principal composition of the formula for making cerium conversion coating:Ce(NO3)3 + KMnO4+ Ce-1 (chemical additive), In order to determine each composition of the formula and the technology parameters scientifically, L9(34) orthogonal testing method was adopted, and the formula of surface modification solution was optimized, the technological conditions for making cerium conversion coating on the surface of aircraft envelope were determined. Results of corrosion resistance and wear resistance of the cerium conversion coating on the surface of the aluminum alloy LY12 aircraft envelope obtained by the new technology showed: 1. On the given test conditions, the best content of each chemical composition in the formula of modification solution for making cerium conversion coating on the surface were: l.Ce(NO3)3：14g/L,KMnO4：1g/L,addictive Ce-1:0.3g/L；Main technology parameters were ：pH=1.5～2.7;temperature：20°C；time:15~25 min.；2. Under the same test condition, the corrosion resistance of surface of the cerium conversion coating obtained in test modification solution was better than Alodine 1001 obtained from Bombardier Corporation of Canada, and can meet the repairing demands of Aircraft Envelope.

The Effect of Complexing Agent on the Surface of Aluminum Alloy Plating Ni-P Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 332-335
Author(s):  
Qing Hua Chang ◽  
Zhen Zhen Chang ◽  
Yu Ting Bai ◽  
Xiao Yu Chen ◽  
Die Peng
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Deposition Rate ◽  
Acid Concentration ◽  
Malic Acid ◽  
Complexing Agents ◽  
Complexing Agent ◽  
Coating Uniformity ◽  
Alloy Plating ◽  
Electroless Ni

In this paper, the effect of different concentrations of complexing agent on the surface of aluminum alloy plating Ni-P alloys is studied. Study the influence of malic acid complexing agents on the electroless Ni-P alloy deposition rate, morphology, corrosion resistance, and determine the optimal complexing agent concentration. The results show that when the malic acid concentration is 24g /L, the deposition rate gets to maximum, and coating uniformity, structure compact and corrosion resistance is best.

scholarly journals Process Performance Analysis and Improvement for the Manufacture of 6063 Aluminum Alloy

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 605 ◽  
Author(s):  
Chang-Hsien Hsu
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Chemical Elements ◽  
Pure Aluminum ◽  
Ferrous Metal ◽  
International Standards ◽  
Quality Analysis ◽  
6063 Aluminum Alloy

As industrial manufacturing technologies continuously improve, many conventional industrial materials are struggling to meet the needs of today’s industries. Aluminum alloys are currently the most extensively used non-ferrous metal in the industry, whose properties include corrosion resistance, high strength, and high ductility. As a result, they are widely used in many products, such as doors and windows, vehicles, and electronics. Pure aluminum though, is a very soft, silver-white metal, so to increase its strength, aluminum alloy manufacturers add in various chemical elements (such as magnesium, silicon, and zinc) according to international standards, and then adjust the proportions based on customer needs. If the chemical element composition does not meet specification requirements, it will affect the quality of the aluminum alloy product or even delay delivery and subsequently impact the operational performance of the manufacturer. To ensure and increase aluminum alloy quality, this study used a combined Six Sigma quality index (SSQI), Qpc, to develop a multi-characteristic quality analysis model (MCQAM) with five steps for the aluminum alloy industry. A practical example with a manufacturer specializing in producing 6063 aluminum alloys in Taiwan is given to demonstrate the effectiveness and feasibility of this proposed approach. The result shows that the proposed method not only effectively improves the quality of 6063 aluminum alloy, but also enhances its performance and capability (that is, corrosion resistance increases by 17%, strength increases by 8%, and stiffness increases by 3%). Finally, future works are also discussed in this context.

scholarly journals Surface Analysis for Signs of Corrosion of Fixed Orthodontic Appliances Used In Vivo

2016 ◽  
Vol 16 (3) ◽  
pp. 5-14
Author(s):  
M. Łępicka ◽  
M. Grądzka-Dahlke
Keyword(s):  
Corrosion Resistance ◽  
Electron Microscope ◽  
Surface Defects ◽  
Orthodontic Appliances ◽  
Casting Defects ◽  
X Ray ◽  
Fixed Orthodontic Appliances ◽  
Scanning Electron

Abstract The objective was to evaluate and assess the surface quality of fixed orthodontic appliances after intraoral usage for several months. Nine sets of orthodontic brackets by three different manufacturers and twelve archwires differing in chemical composition were analyzed in a scanning electron microscope with an energy dispersive X-ray analyzer for signs of corrosion. Obtained results showed that the majority of the evaluated appliances displayed no traces of corrosion. Machining or casting defects hardly ever act as the origins of corrosion processes. However, some samples displayed signs of corrosion of a galvanic and pitting nature. The authors claim, that despite the surface defects, most of the appliances were able to retain the desired corrosion resistance, although in some cases these flaws could act as the origin of corrosion processes.

scholarly journals Enhancement of Corrosion Resistance and Microbial Protection Analysis of a Rosin Coating with the Incorporation of Leucaena leucocephala

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 825
Author(s):  
Wan Mohamad Ikhmal Wan Mohamad Kamaruzzaman ◽  
Maria Fazira Mohd Fekeri ◽  
Muhamad Syaizwadi Shaifudin ◽  
Wan Rafizah Wan Abdullah ◽  
Wan Mohd Norsani Wan Nik ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Electron Microscope ◽  
Leucaena Leucocephala ◽  
Electrochemical Impedance ◽  
Steel Grade ◽  
X Ray ◽  
Coating Formulation ◽  
Scanning Electron

Leucaena leucocephala leaves extract (LLE) was incorporated as an additive in a new coating formulation. The coatings containing different wt.% of the extracts were analysed by optical characterizations and we proceeded to the antimicrobial assessment. The coating was applied onto the surface of stainless steel grade 316L and immersed in seawater for 50 days. A batch of specimens was collected every 10 days and evaluated through electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and scanning electron microscope with energy dispersive X-ray (SEM/EDX). The incorporation of 3 wt.% LLE into the coating (P2) matrix remarkably boosted the barrier quality of the coating.

The Influence of Complexing Agent to the Function of Electroless Plating of P-Ni Alloy on Magnesium Alloy

2010 ◽  
Vol 146-147 ◽  
pp. 327-330
Author(s):  
Yan Fang Chen ◽  
Xue Tao Yu ◽  
Yan Jie Qi ◽  
Ming Yue Ma ◽  
Qing Hua Chang
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Electroless Plating ◽  
Sodium Citrate ◽  
Complexing Agent ◽  
Az31b Magnesium Alloy ◽  
Ni Alloy ◽  
The Matrix ◽  
Buffering Agent ◽  
Scanning Electron

To improve the corrosion resistance and wear resistance of AZ31B magnesium alloy, in this dissertation, we use the method making AZ31B magnesium alloy as the matrix to make coating on the way of electroless plating nickel-phosphor directly. In this study, we make experiments on the influence of concentration of complexing agent in electroplating to electroless plating on the surface of magnesium alloy. We utilize the scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and the detection of corrosion resistance etc. To analyze the morphology, composition and corrosion resistance of coating. We come to a conclusion that the reaction is at the soonest when we adopt sodium citrate as buffering agent and its density is10ml/L., meanwhile, the coating particle is tiny and is well-knit with matrix. What’s more, phosphorus contents are maximum and the corrosion resistance is greatest.

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