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.

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.

BEHAVIOR OF PLASMA-SPRAYED HYDROXYAPATITE COATINGS ONTO CARBON/CARBON COMPOSITES IN SIMULATED BODY FLUID

2007 ◽  
Vol 14 (06) ◽  
pp. 1073-1078 ◽  
Author(s):  
JIN-LING SUI ◽  
WU BO ◽  
ZHOU HAI ◽  
NING CAO ◽  
MU-SEN LI
Keyword(s):  
Simulated Body Fluid ◽  
Calcium Ion ◽  
Body Fluid ◽  
Ph Value ◽  
Carbon Composite ◽  
Ion Concentration ◽  
Human Blood Plasma ◽  
Hydroxyapatite Coatings ◽  
Plasma Sprayed ◽  
Calcium Ion Concentration

Two types of hydroxyapatite (HA) coatings onto carbon/carbon composite ( C / C composites) substrates, deposited by plasma spraying technique, were immersed in a simulated body fluid (SBF) in order to determine their behavior in conditions similar to the human blood plasma. Calcium ion concentration, pH value, microstructure, and phase compositions were analyzed. Results demonstrated that both the crystal Ca – P phases or the amorphous HA do dissolve slightly, and the dissolution of CaO phases in SBF was evident after 1 day of soaking. The calcium-ion concentration was decreased and the pH value of SBF was increased with the increasing of the immersing time. The precipitation was mainly composed of HA, which was verified by X-ray diffraction (XRD) and electron-probe microanalyzer.

Influence of temperature and chloride ion concentration on the corrosion behaviour of Mg–4Al–3Ca–0.5RE alloy

2019 ◽  
Vol 70 (7) ◽  
pp. 1214-1221
Author(s):  
Xinhong Xiong ◽  
Lianbo Chen ◽  
Kaixiong Hu ◽  
Zhiping Wang ◽  
Qiaoxin Zhang ◽  
...  
Keyword(s):  
Corrosion Behaviour ◽  
Chloride Ion ◽  
Ion Concentration ◽  
Influence Of Temperature

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.

Thermodynamic Analysis of Trace Cobalt(II) Extraction from Cobalt Chloride Aqueous Solution Using Cyanex 272 in Kerosene

2021 ◽  
Vol 16 (2) ◽  
pp. 249-254
Author(s):  
Zhi-Qiang Ning ◽  
Chun-Yuan Sang ◽  
Jia-Hui Liu ◽  
Hong-Wei Xie ◽  
Qiu-Shi Song ◽  
...  
Keyword(s):  
Distribution Ratio ◽  
Ph Value ◽  
Equilibrium Constants ◽  
Chloride Ion ◽  
Ion Concentration ◽  
Extraction Temperature ◽  
Extractant Concentration ◽  
Cyanex 272 ◽  
Different Temperatures ◽  
The Relationship

In this study, it was researched that the extraction of Co(II) from CoCl2 aqueous solutions using Cyanex 272 (bis(2,4,4-trimethylpentyl) phosphonic acid) in kerosene and determined the effects of the equilibrium pH value, extractant concentration and chloride ion concentration on the extraction of cobalt at different temperatures. The results indicate that the distribution ratio of cobalt increases as the equilibrium pH value, extractant concentration and extraction temperature increase. However, the cobalt distribution ratio decreases as the chloride ion concentration increases. We calculated the equilibrium constants (AH9, AG9, and AS9) for a range of temperatures and investigated the relationship between AG9 and T. The extraction reaction of cobalt was determined to be an endothermic reaction; thus, raising the temperature was beneficial to the reaction.

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