An Electroless E-Coating Bath Sealing Technique for a Phosphated Magnesium Alloy

Song, Guang Ling

doi:10.4028/www.scientific.net/MSF.618-619.269

文章题目

Development of High Performance Magnesium Alloys via Microstructure and Texture Control
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A Preliminary Quantitative XPS Study of the Surface Films Formed on Pure Magnesium and on Magnesium-Aluminium Intermetallics by Exposure to High-Purity Water
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Influence of Laser Surface Melting on the Microstructure and Corrosion Behaviour of ZE41 Magnesium Alloy
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An Electroless E-Coating Bath Sealing Technique for a Phosphated Magnesium Alloy
p.269

In Situ X-Ray Microtomography Investigation of the Deformation Mechanisms of Al-Cu Alloys in the Semi-Solid State
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A Novel Micro-Arc Anodising Process for Aluminium Alloys Containing High Silicon
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Surface Modification of Metallic Biomaterials for Orthopaedic Applications
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Laser Welding of Titanium and its Alloys for Medical Applications: Current Knowledge and Future Direction
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首页Materials Science ForumLight Metals Technology 2009An Electroless E-Coating Bath Sealing Technique...

An Electroless E-Coating Bath Sealing Technique for a Phosphated Magnesium Alloy

摘要:

The corrosion resistance of phosphated Mg components is very low. A low cost and high corrosion resistant sealing technique is particularly desired. In this study, a new sealing technique was proposed and validated in laboratory trials. Phosphated AZ91D was simply dipped in an E-coating bath solution for a few seconds. After baking, the specimens were found to have considerably improved corrosion resistance.

信息:

期刊:

Materials Science Forum (618-619卷)

主题:

Light Metals Technology 2009

编辑:

M.S. Dargusch & S.M. Keay

页数:

269-271

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.618-619.269

引用:

G. L. Song, "An Electroless E-Coating Bath Sealing Technique for a Phosphated Magnesium Alloy", Materials Science Forum, Vols. 618-619, pp. 269-271, 2009

上线时间:

April 2009

作者:

Guang Ling Song

关键字:

Corrosion, e-Coating, Magnesium, Phosphate Coating

输出:

RIS, BibTeX

价格:

$38.00

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文章题目页数

EIS Study of Molybdate Conversion Coatings Formed on AZ91D Magnesium Alloy

作者: Li Ping Wu, Zhong Dong Yang

摘要: An environmentally friendly molybdate conversion coating based surface treatment was developed for AZ91D magnesium alloy. The EIS technique was employed to study the effects of the conversion bath composition and temperature on the corrosion protection performance of molybdate conversion coatings on AZ91D magnesium alloys. The optimum conditions under which obtained conversion coatings showed the best corrosion resistance were determined. The Nyquist results showed that the value of charge transfer resistance increased by 22.5 times for the sample treated in the optimized molybdate conversion bath.

279

Fast Electroless Ni-P Coating on AM60 Magnesium Alloy at Low Bath Temperature

作者: Guo Bing Mao

摘要: The Ni-P coatings were deposited on AM60 magnesium alloy by electroless plating process without or with accelerators. Without accelerators, the deposition rate is slow and required high bath temperature to obtain compact coating. There have many defects on the surface of the Ni-P coatings which deposited at high bath temperature. The composite accelerators were introduced into the bath for improving the growth rate and the quality of the Ni-P coating. Uniform, with no pores or cracks, “cauliflower-like” structure and complete Ni-P coatings were deposited only taken 20 min with additives at low bath temperature. The XRD result indicates that the structure of the Ni-P coating is amorphous nickel. The corrosion test results indicated that the corrosion resistance of this coated AM60 magnesium alloys increases distinctly as compared to bare alloys.

756

Electroless Sn Deposition on Magnesium Alloy and Wastewater Treatment

作者: Li Yuan Niu, Yi Chang Su, Da Ren Sun, Guang Yu Li

摘要: The new process electroless Sn deposition on cast AZ61 was revealed, which employed to AZ61 magnesium alloy automobile parts and could provide high wear-resistant and high hardness. The pretreatment processes before electroless Sn deposition could ensure better adhesion between Sn coating and magnesium alloy. The speed of the Sn deposition increases quickly with increasing the content of composite catalysts in the plating bath. The technology is environment friendly and cannot cause hazard to environment because of absence of nickel and chromate in the whole process. Wastewater treatment technology of electroless Sn bath was investigated as well.

119

The Influence of Deposition Temperature on the Morphology and Corrosion Resistance of Zinc Phosphate Coating on Mild Steel

作者: Khalid Abdalla, Rahmat Azmi, Aziz Azizan

摘要: The influence of phosphating temperature on the surface morphology and corrosion resistance of zinc phosphate coatings on mild steel was investigated. The phosphate layers were deposited on steel from phosphating bath at different temperatures (45 ~ 75 C). The surface morphology and composition of phosphate coatings were investigated via scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX). The corrosion resistance of the coatings was evaluated by polarization curves (anodic and cathodic) in an aerated 3.5% NaCl solution. The results showed that the increase in temperature of the phosphating bath up to 55 C caused an increase in surface coverage and in turn resulted in better corrosion resistance. At high temperature (65 °C and 75 °C) the deposition coverage decreased indicating that the best coverage for the phosphate layer on the metal surface was achieved at 55 °C

183

Optimization of Electroless Ni-P-Nano-TiO₂ Coating Parameters Using Taguchi Method for Corrosion Performance

作者: T.R. Tamilarasan, R. Sathish Kumar, R. Rajendran, G. Rajagopal

摘要: This article considers an experimental study of Taguchi’s parameters design to maximize the corrosion resistance of electroless Ni-P-nano-TiO₂ on low carbon steel substrate. The experiments were carried out based on Taguchi’s L9 orthogonal array considering four coating parameters of three levels each namely, Bath Temperature, pH of bath, Bath Loading, and concentration of TiO₂. Scanning Electron Microscope (SEM) equipped with Energy Dispersive X-ray Spectroscopy (EDS) facilitated the study of the surface morphology and the chemical composition of the coatings. Corrosion performance of the deposits was evaluated by Tafel polarization technique in 3.5 wt. % of NaCl solution. The observation shows that pH level has more significant influence on the corrosion behavior of the composite deposit. The experimental study revealed that the optimum conditions are A3B3C2D1 (Temperature of 88° C, pH of 6, bath loading of 0.5 dm²/l, and TiO₂ concentration of 2 g/l).