Corrosion behaviour of friction stir welded rare earth magnesium alloy ZE41 under salt spray test

2021 ◽  
Author(s):  
N. Sivashanmugam ◽  
K. L. Harikrishna ◽  
S. R. Koteswara Rao ◽  
A. K. Lakshminarayanan
Keyword(s):  
Rare Earth ◽  
Magnesium Alloy ◽  
Corrosion Behaviour ◽  
Salt Spray ◽  
Salt Spray Test ◽  
Friction Stir

A COMPARATIVE STUDY TO EVALUATE THE CORROSION PERFORMANCE OF FRICTION STIR WELDED AZ31B MAGNESIUM ALLOY UNDER IMMERSION, SALT FOG, PITTING AND GALVANIC CORROSION TESTS UNDER NACL ENVIRONMENT

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Ashok Kumar M ◽  
Thirumalaikumarasamy D ◽  
Paventhan R ◽  
Thirumal P
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Behaviour ◽  
Galvanic Corrosion ◽  
Salt Spray ◽  
Welding Process ◽  
Ion Concentration ◽  
Az31b Magnesium Alloy ◽  
Corrosion Tests ◽  
Friction Stir ◽  
Corrosion Rates

An investigation was carried out to quantify and characterize the corrosion behaviour of AZ31B magnesium alloy joints. Extruded Mg alloy plates of 6 mm thick of AZ31B grade were butt welded using a solid state, environmentally cleaner welding process, friction stir welding process. The weld specimens were underwent immersion, salt spray, pitting and galvanic corrosion tests in order to quantify and characterize the corrosion rates of the welds with the influence of different pH values, chloride ion concentration and the corrosion time. The corrosion rates, microstructure, scanning electron microscopy and X-ray diffraction analysis concludes the optimum parameter for the usage of the magnesium alloy welds for the best service applications. Keywords: Keywords: EDM, Alumina and Genetic Algorithm

Research on Heavy-Duty Coating Protection System of Magnesium Alloy

2015 ◽  
Vol 1119 ◽  
pp. 525-528
Author(s):  
Ru Tang Yan ◽  
Yuan Yuan Li ◽  
Chun Wei She ◽  
Hua Geng Li ◽  
Hua Pan Li
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Salt Spray ◽  
Salt Spray Test ◽  
Protection System ◽  
Test Time ◽  
Test Results ◽  
Ageing Test ◽  
Micro Arc Oxidation ◽  
Resistance Performance

The poor corrosion resistance of magnesium alloys become the bottleneck restricting its development. Based on micro-arc oxidation (MAO) technology and the characteristics of fluorocarbon coating the surface of magnesium alloy build a high corrosion protection system, namely: Based on micro-arc oxidation coating fluorocarbon coatings. The formation of the composite coating through the resistance to ageing test through the resistance to ageing test, acid and alkali experiment and salt spray test results show the excellent corrosion resistance performance. Among them, the resistance to salt spray test time can reach 1500 h, which breaks the bottleneck of magnesium alloy corrosion resistance of 1000 h.

scholarly journals Corrosion Behaviour of Preserved PEO Coating on AZ31 Magnesium Alloy

2020 ◽  
Vol 23 (2) ◽  
pp. B76-B88
Author(s):  
Filip Pastorek ◽  
Milan Štrbák ◽  
Daniel Kajánek ◽  
Martina Jacková ◽  
Jana Pastorková ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Treatment Process ◽  
Corrosion Behaviour ◽  
Salt Spray ◽  
Az31 Magnesium Alloy ◽  
Electrochemical Tests ◽  
Marine Transport ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

A surface treatment process, composed of plasma electrolytic oxidation (PEO) and sealing by temporary oil preservation system containing corrosion inhibitors, was performed on AZ31 magnesium alloy in order to improve its corrosion resistance in environments containing chlorides. Both atmospheric and immersion conditions were evaluated by electrochemical tests in 0.1M NaCl solution together with salt spray test according to STN EN ISO 9227 standard. The obtained results confirmed significant improvement of corrosion resistance reached by the PEO sealing in aggressive environments compared to the pure PEO coating on AZ31 surface. Hence, such a duplex coating is a very perspective alternative for magnesium alloy applications in severe conditions or for temporary protection of magnesium products coated by the PEO during marine transport.

Influence of Plasma Electrolytic Oxidation coating on corrosion characteristics of Friction Stir Welded ZE41 rare earth Magnesium alloy

2021 ◽  
Author(s):  
N Sivashanmugam ◽  
KL Harikrishna ◽  
S R Koteswara Rao ◽  
N Rameshbabu ◽  
P Manojkumar
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Magnesium Alloy ◽  
Plasma Electrolytic Oxidation ◽  
Dense Layer ◽  
Metallographic Examination ◽  
Friction Stir ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Abstract Magnesium and its alloys are extensively used in the defence, aerospace and automotive industries, owing to their excellent mechanical properties. But there is a requirement of corrosion prevention treatment before using it for applications, since the corrosion resistance of Mg alloy is poor. In this work, a study on the mechanical properties of friction stir welded ZE41 rare earth magnesium alloy thick plates of 15mm and 25mm, was carried out. A metallographic examination and mechanical tests were conducted on both the welds. Furthermore, Plasma Electrolytic Oxidation (PEO), a surface conversion treatment was carried out on both the base material as well as on the friction stir butt joints. X-ray diffraction and scanning electron microscopy analysis were carried out on all the samples, with and without coating. The coated and uncoated samples were assessed by potentiodynamic polarisation (PDP) tests and electrochemical impedance spectroscopy (EIS) to study the electrochemical corrosion behaviour. An outer porous layer and an inner dense layer, have been identified from the SEM images. From the corrosion tests results it was revealed that there was an improvement in the corrosion resistance of both the base metal as well as the weldments by the PEO coating process.

Friction stir spot welding of rare-earth containing ZEK100 magnesium alloy sheets

2014 ◽  
Vol 56 ◽  
pp. 750-754 ◽  
Author(s):  
H.M. Rao ◽  
R.I. Rodriguez ◽  
J.B. Jordon ◽  
M.E. Barkey ◽  
Y.B. Guo ◽  
...  
Keyword(s):  
Rare Earth ◽  
Magnesium Alloy ◽  
Spot Welding ◽  
Friction Stir Spot Welding ◽  
Friction Stir

scholarly journals Experimental Investigation of the Corrosion Behavior of Friction Stir Welded AZ61A Magnesium Alloy Welds under Salt Spray Corrosion Test and Galvanic Corrosion Test Using Response Surface Methodology

2013 ◽  
Vol 2013 ◽  
pp. 1-17 ◽  
Author(s):  
A. Dhanapal ◽  
S. Rajendra Boopathy ◽  
V. Balasubramanian ◽  
K. Chidambaram ◽  
A. R. Thoheer Zaman
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Rate ◽  
Corrosion Test ◽  
Ph Value ◽  
Galvanic Corrosion ◽  
Salt Spray ◽  
Chloride Ion ◽  
Ion Concentration ◽  
Salt Spray Corrosion ◽  
Friction Stir

Extruded Mg alloy plates of 6 mm thick of AZ61A grade were butt welded using advanced welding process and friction stir welding (FSW) processes. The specimens were exposed to salt spray conditions and immersion conditions to characterize their corrosion rates on the effect of pH value, chloride ion concentration, and corrosion time. In addition, an attempt was made to develop an empirical relationship to predict the corrosion rate of FSW welds in salt spray corrosion test and galvanic corrosion test using design of experiments. The corrosion morphology and the pit morphology were analyzed by optical microscopy, and the corrosion products were examined using scanning electron microscope and X-ray diffraction analysis. From this research work, it is found that, in both corrosion tests, the corrosion rate decreases with the increase in pH value, the decrease in chloride ion concentration, and a higher corrosion time. The results show the usage of the magnesium alloy for best environments and suitable applications from the aforementioned conditions. Also, it is found that AZ61A magnesium alloy welds possess low-corrosion rate and higher-corrosion resistance in the galvanic corrosion test than in the salt spray corrosion test.

Microstructure, texture, and mechanical properties of friction stir spot welded rare-earth containing ZEK100 magnesium alloy sheets

2014 ◽  
Vol 618 ◽  
pp. 637-644 ◽  
Author(s):  
R.I. Rodriguez ◽  
J.B. Jordon ◽  
H.M. Rao ◽  
H. Badarinarayan ◽  
Wei Yuan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Magnesium Alloy ◽  
Friction Stir ◽  
Spot Welded
Sign in / Sign up

Export Citation Format

Share Document