Effect of pH, Chloride Ion Concentration and Immersion Time on the Microstructural and Corrosion Properties of Atmospheric Plasma Sprayed Alumina Coatings on AZ31B Magnesium Alloy Under Immersion Environment

2016 ◽  
Vol 11 (1) ◽  
pp. 62-71
Author(s):  
D. Thirumalaikumarasamy ◽  
K. Shanmugam ◽  
V. Balasubramanian ◽  
S. Viknesh
Keyword(s):  
Magnesium Alloy ◽  
Immersion Time ◽  
Chloride Ion ◽  
Atmospheric Plasma ◽  
Ion Concentration ◽  
Alumina Coatings ◽  
Corrosion Properties ◽  
Effect Of Ph ◽  
Az31b Magnesium Alloy ◽  
Plasma Sprayed

Microstructural and Corrosion Properties of Atmospheric Plasma Sprayed Alumina Coatings on AZ31B Magnesium Alloy Under Sodium Chloride Environment

2016 ◽  
Vol 16 (2) ◽  
pp. 89-102
Author(s):  
D. Thirumalai kumarasamy ◽  
K. Shanmugam ◽  
V. Balasubramanian ◽  
S. Vignesh
Keyword(s):  
Magnesium Alloy ◽  
Immersion Time ◽  
Ph Value ◽  
Chloride Ion ◽  
Atmospheric Plasma ◽  
Ion Concentration ◽  
Design Matrix ◽  
Alumina Coatings ◽  
Az31b Magnesium Alloy ◽  
Plasma Sprayed

AbstractThe corrosion deterioration process of plasma sprayed alumina coatings on AZ31B magnesium alloy was investigated using immersion corrosion test in NaCl solution at different chloride ion concentrations, pH value and immersion time. The experiments were conducted based on a three factor, five level, central composite rotatable design matrix with full replications technique. Response surface methodology was used to develop the relationship. The developed relationship can be effectively used to predict the corrosion rate of plasma sprayed alumina coatings on AZ31B magnesium alloy at 95 % confidence level. The results showed that the corrosion deterioration of alumina coated magnesium alloy in NaCl solutions was significantly influenced by chloride ion concentration and pH value. The alumina coatings were found to be highly susceptible to localized damage, and could not provide an effective corrosion protection to Mg alloy substrate in solutions containing acidic environments (pH3), higher chloride concentrations and immersion time.

Microstructure and Corrosion Behavior of Hot Compressed AZ31B Magnesium Alloy Joint

2016 ◽  
Vol 849 ◽  
pp. 121-127
Author(s):  
Ya Jie Chu ◽  
Xin Chen Han ◽  
Zong Hui Yang ◽  
Xiao Quan Li
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Immersion Time ◽  
Chloride Ion ◽  
Immersion Test ◽  
Ion Concentration ◽  
Corrosion Morphology ◽  
Az31b Magnesium Alloy ◽  
Gas Tungsten Arc

The extruded AZ31B magnesium alloy plates of 4 mm thickness were butt welded using gas tungsten arc welding (GTA) process. The microstructure and corrosion behavior of the hot compressed welds were evaluated by conducting immersion test in NaCl solution at different immersion time and chloride ion concentrations. The specimens were exposed to immersion in order to characterize their corrosion rates. The corrosion morphology and pit morphology observation was carried out by scanning electron microscopy (SEM). The results showed that the corrosion rate of hot compressed magnesium alloy welds decreased with the increase in immersion time and the corrosion rate increased with the increase in chloride ion concentration, and the corrosion morphology was predominantly influenced by the distribution of β-phase.

scholarly journals Investigate the corrosion properties of stellite coated on AZ91D alloy by plasma spray technique

2021 ◽  
pp. 209-209
Author(s):  
Mathivanan Kannan ◽  
Thirumalaikumarasamy Duraisamy ◽  
Thirumal Pattabi ◽  
Ashokkumar Mohankumar
Keyword(s):  
Exposure Time ◽  
Regression Models ◽  
Ph Value ◽  
Corrosion Behaviour ◽  
Chloride Ion ◽  
Atmospheric Plasma ◽  
Ion Concentration ◽  
Corrosion Properties ◽  
Component Manufacturing ◽  
Plasma Sprayed

Stellite alloys are primarily preferred in various component manufacturing industries due to its magnificent mechanical and electrochemical properties. The stellite powder is deposited over the materials by Various thermal spray methods in industries. This research proposed investigating the microstructure and corrosion properties of stellite powder that is deposited on an AZ91D magnesium alloy substrate by atmospheric plasma spraying process. SEM, optical microscopy, and atomic force microscopy are typical of the coatings. Immersion experiments in sodium chloride conditions are conducted at varying pH levels, chloride ion concentration, and exposure time. In addition, XRD examined the phase change properties of the powder and sprayed condition of coatings along with corrosion testing. The corrosion experiments were conducted to establish several regression models based on the central composite design and the response surface process. The accuracy of the regression models was sufficient to allow correlations between input parameters and responses through variance analysis. It was found that the pH value significantly influences the corrosion behaviour of stellite coatings followed by other parameters such as chloride ion concentration and exposure time; even in corrosion tests, plasma-sprayed coatings performed better.

Sign in / Sign up

Export Citation Format

Share Document