scholarly journals Improvement of Corrosion Resistance of Ni–P–Al2O3 Composite Coating by Optimizing Process Parameters Using Potentiodynamic Polarization Test

2014 ◽  
Vol 32 (2) ◽  
pp. 137-156 ◽  
Author(s):  
P Gadhari ◽  
P Sahoo
Keyword(s):  
Corrosion Resistance ◽  
Composite Coating ◽  
Process Parameters ◽  
Potentiodynamic Polarization ◽  
Potentiodynamic Polarization Test ◽  
Al2o3 Composite ◽  
Polarization Test

scholarly journals Microstructure, friction and corrosion resistance properties of a Ni–Co–Al2O3 composite coating

RSC Advances ◽  
2018 ◽  
Vol 8 (22) ◽  
pp. 12138-12145 ◽  
Author(s):  
Zong-wei Jia ◽  
Wan-chang Sun ◽  
Fang Guo ◽  
Ya-ru Dong ◽  
Xiao-jia Liu
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Composite Coating ◽  
Composite Coatings ◽  
Al2o3 Composite ◽  
Pulsed Electrodeposition

Ni–Co–Al2O3 composite coatings were prepared by pulsed electrodeposition and electrophoresis–electrodeposition on aluminum alloy.

Improvement of microstructure and properties of Ni–Al2O3 composite coating via jet electrodeposition

2020 ◽  
Vol 34 (27) ◽  
pp. 2050243
Author(s):  
Hui Fan ◽  
Jie Jiang ◽  
Yangpei Zhao ◽  
Shankui Wang ◽  
Zhijing Li
Keyword(s):  
Wear Rate ◽  
Surface Morphology ◽  
Composite Coating ◽  
Process Parameters ◽  
Current Density ◽  
Composite Coatings ◽  
Coating Structure ◽  
Mechanical And Tribological Properties ◽  
Al2o3 Composite ◽  
Jet Electrodeposition

Ni–Al2O3 composite coatings were prepared with a modified Watt’s bath by using jet electrodeposition method. As the key process parameter, current density and the addition of Al2O3 nanoparticles in electrolyte were studied about the effect on the surface morphology and co-deposition of Al2O3 nanoparticles of composite coating. The mechanical and tribological properties of the composite coating were also tested. The results show that properly increasing the current density and Al2O3 addition can increase the co-deposition of nanoparticles in the coating and promote the formation of a dense and refined coating structure. Using the optimized process parameters of current density (300 A/dm2) and Al2O3 addition (30 g/L), the co-deposition of Al2O3 in the composite coating can reach a maximum of 13.1 at.%. The hardness of the coating reaches the peak at 623 HV. The wear rate of the composite coating is also greatly reduced with optimized parameters.

Electrochemical Properties of UFG CP-Ti in Ringer’s Solution

2010 ◽  
Vol 667-669 ◽  
pp. 1083-1088
Author(s):  
Hong Jiang ◽  
Chao Ying Xie
Keyword(s):  
Electrochemical Properties ◽  
Potentiodynamic Polarization ◽  
Electrochemical Techniques ◽  
Coarse Grain ◽  
Corrosion Properties ◽  
Ringer’S Solution ◽  
Potentiodynamic Polarization Test ◽  
Polarization Test ◽  
Cp Ti ◽  
Scanning Electron

The effect of ECAE pass number on the electrochemical properties of CP-Ti was investigated by electrochemical techniques (potentiodynamic polarization test, potentiodynamic polarization test and surface analyses (OM, scanning electron microscopy (SEM) in Ringer’s solution at 37°C. The results show that the corrosion resistance of muli-pass ECAE CP-Ti samples is superior to the coarse grain CP-Ti. The effect of texture of ECAEed samples parallel to the surface on the corrosion properties has been discussed.

scholarly journals Effect of Cu2+ on Corrosion Behavior of A106B Carbon Steel and 304L Stainless Steels in Seawater

Scanning ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Kewei Fang ◽  
Chengtao Li ◽  
Shuai Dong ◽  
Dubao Zhang ◽  
Xiangfeng Wu ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Stainless Steels ◽  
Potentiodynamic Polarization ◽  
Corrosion Potential ◽  
Immersion Test ◽  
304L Stainless Steel ◽  
Passive Region ◽  
Potentiodynamic Polarization Test ◽  
Polarization Test ◽  
Corrosion Behaviors

The corrosion behaviors of A106B carbon steel and 304L stainless steel (SS) in seawater with different Cu2+ concentrations were studied by the immersion test and the potentiodynamic polarization test. The results showed that with the increasing Cu2+ concentration, the mass lot rates of A106B and 304L SS all increased in the immersion test, and compared with A106B, the mass lot rates of 304L SS were all smaller. In the potentiodynamic polarization test, following the concentration of Cu2+ increased, the corrosion potential of A106B firstly shifted negatively; then, when Cu2+ increased to 100 ppm, the polarization curve moved to the upper right direction; namely, both the corrosion potential and corrosion electrical density increased. The corrosion potential of 304L SS increased with the increasing Cu2+, and the passive region was reduced; the pitting sensitivity improved.

Influence of Organic Sealed on the Corrosion Behaviors of Micro Arc Oxidation Coated ZM5 Magnesium Alloy

2011 ◽  
Vol 418-420 ◽  
pp. 844-847 ◽  
Author(s):  
Jian Jun Xi ◽  
Jun Zhao
Keyword(s):  
Magnesium Alloy ◽  
Potentiodynamic Polarization ◽  
Corrosion Performance ◽  
Organic Solution ◽  
Potentiodynamic Polarization Test ◽  
Polarization Test ◽  
Micro Arc Oxidation ◽  
Corrosion Behaviors

An attempt was made to produce organic sealed micro arc oxidation coatings on ZM5 magnesium alloy using two different kinds of organic solution which are acrylics and PTFE. The thickness, potentiodynamic polarization test, corrosion weight lost and morphologies of the coatings were investigated. The results indicate that PTFE sealed micro arc oxidation coatings has relatively dense and uniform surface to show the best anti-corrosion performance.

scholarly journals Effect of Oxygenated Additives on the Corrosion Behavior of Al-Si-Cu Alloy in Synthetic Condensed Automotive Solution

2012 ◽  
Vol 23 (2) ◽  
pp. 3-18
Author(s):  
Rana A. Majed Rana A. Majed
Keyword(s):  
Corrosion Resistance ◽  
Hysteresis Loop ◽  
Corrosion Behavior ◽  
Potentiodynamic Polarization ◽  
Room Temperature ◽  
Cyclic Polarization ◽  
Cu Alloy ◽  
Oxygenated Additives ◽  
Automotive Fuel ◽  
Polarization Test

t. This work involves studying the effect of adding alcohols on corrosion behavior of Al-Si-Cu alloy in synthetic condensed automotive solution (CSAS) at room temperature. Alcohols used were methanol (MeOH), ethanol (EtOH), porpanol (PropOH), Butanol (ButOH), and mixture of (MeOH-EtOH), (MeOH-PropOH) and (MeOH-ButOH). According to potentiodynamic polarization test, the results of corrosion resistance indicate that additive alcohols increase the resistance of Al-Si-Cu alloy, except addition of ethanol to the CSAS and the resistance follows the sequence: MeOH. > ButOH > MeOHButOH > MeOH-PropOH > PropOH > MeOH-EtOH. Cyclic polarization measurements were carried out to estimate the pitting resistance of Al-Si-Cu alloy in CSAS in the absence and presence of alcohols, this test shows that the hysteresis loop appears only in cases of presence of ethanol and (MeOH-EtOH) mixture in CSAS indicating the disadvantage of adding ethanol and (MeOH-EtOH) mixture to automotive fuel.

The Effect of Al2O3 Concentration on Properties of Ni-W-P-Al2O3 Electroless Composite Coating

2012 ◽  
Vol 468-471 ◽  
pp. 1163-1166 ◽  
Author(s):  
Wan Chang Sun
Keyword(s):  
Corrosion Resistance ◽  
Composite Coating ◽  
Potentiodynamic Polarization ◽  
Steel Substrate ◽  
Optical Microscope ◽  
Micro Hardness ◽  
Plating Bath ◽  
Hardness Tester ◽  
Al2o3 Concentration ◽  
Plating Solution

Ni-W-P-Al2O3 electroless composite coating was successfully co-deposited on 45 steel substrate using electroless plating. Optical microscope (OM), micro-hardness tester and potentiodynamic polarization were used to analyze the morphology, micro-hardness and corrosion resistance of the composite coating. The effect of Al2O3 concentration in the plating solution on the micro-hardness and corrosion resistance of the composite coating was mainly discussed. The results show that Al2O3 particles co-deposit with Ni-W-P homogeneously. The micro-hardness and corrosion resistance of the coating are improved with the increasing of Al2O3 concentration in the plating bath, and then decrease at a high Al2O3 concentration.

Characterization and Corrosion Behavior of Biodegradable Mg-Ca and Mg-Ca-Zn Implant Alloys

2011 ◽  
Vol 121-126 ◽  
pp. 568-572 ◽  
Author(s):  
Hamid Reza Bakhsheshi Rad ◽  
Mohd Hasbullah Idris ◽  
Mohammed Rafiq Abdul Kadir ◽  
Saeed Farahany ◽  
Amir Fereidouni ◽  
...  
Keyword(s):  
Grain Size ◽  
Corrosion Resistance ◽  
Molten Metal ◽  
Corrosion Behavior ◽  
Potentiodynamic Polarization ◽  
Electrochemical Test ◽  
Lamellar Eutectic ◽  
Polarization Test ◽  
Implant Alloys ◽  
Zn Alloys

In the present study binary Mg-xCa (x=0.5 and 1.25wt.%) and ternary Mg-1Ca-xZn (x=0.5 and 1.5wt.%) alloys are produced by casting the molten metal in a metal die at a temperature of 740°C. The microstructure analysis of the Mg-Ca and Mg-Ca-Zn alloys were studied by OM, SEM and EDX. The corrosion behavior of alloys was evaluated via potentiodynamic polarization test in Kokubo solution. The result exhibited that the grain size decrease with rising Ca content in Mg-Ca alloys and degree of grain size reduction further decreased by adding Zn to Mg-1Ca-Zn alloys. The microstructure of Mg-Ca alloys were constituted of primary Mg and lamellar eutectic (α-Mg+Mg2Ca) phase, Whilst Mg–1Ca-Zn alloys were composed of primary Mg and eutectic (α-Mg+Mg2Ca+Ca2Mg6Zn3) phases. In addition with increasing Ca and Zn the amount of Mg2Ca and Ca2Mg6Zn3 increased respectively in grain boundaries. Electrochemical test shows that the addition of Zn leads to improve corrosion resistance of the Mg–1Ca-Zn alloys as a result of the formation of Ca2Mg6Zn3 phase, whilst the addition of more than 0.5 wt% Ca to Mg-Ca alloys result in decrease corrosion resistance due to the formation Mg2Ca.

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