Improving the corrosion resistance and bioactivity of magnesium by a carbonate conversion-polycaprolactone duplex coating approach

2020 ◽  
Vol 44 (12) ◽  
pp. 4772-4785
Author(s):  
Mohan Sathyaraj Palanisamy ◽  
Ravichandran Kulandaivelu ◽  
Sankara Narayanan T. S. Nellaiappan
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Carbonate ◽  
Duplex Coating ◽  
Duplex Coatings

Decreasing the rate of degradation of Mg has been the focus of developing magnesium carbonate-polycaprolactone duplex coatings for Mg.

Preparation and properties of duplex NI-P-TIO2/NI nanocomposite coatings

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940019 ◽  
Author(s):  
Weihui Zhang ◽  
Di Cao ◽  
Yanxin Qiao ◽  
Yuxin Wang ◽  
Xiang Li ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Porous Structure ◽  
Outer Layer ◽  
Nanocomposite Coating ◽  
Nanocomposite Coatings ◽  
Coating Properties ◽  
Duplex Coating ◽  
Plating Solution

Duplex Ni-P-TiO2/Ni coatings were deposited on the brass substrate by using two baths. Ni-P-TiO2 nanocomposite coatings were electroplated as the outer layer on the Ni-plated brass substrate by adding transparent TiO2 sol (0–50 mL/L) into the Ni-P plating solution. The microstructure, mechanical property and corrosion resistance of the duplex Ni-P-TiO2/Ni nanocomposite coatings were systemically investigated. The results show that the interface of duplex coating was uniform and the adhesion between two layers was extremely good. The microhardness of duplex Ni-P-12.5 mL/L TiO2 /Ni coating was [Formula: see text]616 HV[Formula: see text] compared to [Formula: see text]539 HV[Formula: see text] of Ni-P /Ni coating and [Formula: see text]307 HV[Formula: see text] of single Ni coating. Meanwhile, the wear resistance and the corrosion resistance of the duplex nanocomposite coating have also been improved remarkably compared with single Ni coating. However, adding excessive TiO2 sol (more than 12.5 mL/L) caused the agglomeration of TiO2 nanoparticles and led to a porous structure in the outer layer, resulting in the deterioration of coating properties.

Effects of CrN/EN and Cr2O3/EN duplex coatings on corrosion resistance of ADI

2009 ◽  
Vol 517 (17) ◽  
pp. 5248-5252 ◽  
Author(s):  
Cheng-Hsun Hsu ◽  
Chun-Ying Lee ◽  
Kai-Lin Chen ◽  
Jia-Hong Lu
Keyword(s):  
Corrosion Resistance ◽  
Duplex Coatings

CORROSION RESISTANCE OF Fe–Al/Al2O3 DUPLEX COATING ON PIPELINE STEEL X80 IN SIMULATED OIL AND GAS WELL ENVIRONMENT

2015 ◽  
Vol 22 (04) ◽  
pp. 1550045 ◽  
Author(s):  
MIN HUANG ◽  
YU WANG ◽  
PING-GU WANG ◽  
QIN-YI SHI ◽  
MENG-XIAN ZHANG
Keyword(s):  
Corrosion Resistance ◽  
Oil And Gas ◽  
Pipeline Steel ◽  
Energy Dispersive Spectrometer ◽  
Combined Treatment ◽  
Gas Well ◽  
Corrosion Condition ◽  
Mono Layer ◽  
Duplex Coating ◽  
Al Coating

Corrosion resistant Fe – Al / Al 2 O 3 duplex coating for pipeline steel X80 was prepared by a combined treatment of low-temperature aluminizing and micro-arc oxidation (MAO). Phase composition and microstructure of mono-layer Fe – Al coating and Fe – Al / Al 2 O 3 duplex coating were studied by X-ray diffraction (XRD), scanning electron microscope (SEM) with energy dispersive spectrometer (EDS). Corrosion resistance of the coated pipeline steel X80 in a simulated oil and gas well condition was also investigated. Mono-layer Fe – Al coating consists of Fe 2 Al 5 and FeAl , which is a suitable transitional layer for the preparation of ceramic coating by MAO on the surface of pipeline steel X80. Under the same corrosion condition at 373 K for 168 h with 1 MPa CO 2 and 0.1 MPa H 2 S , corrosion weight loss rate of pipeline steel X80 with Fe – Al / Al 2 O 3 duplex coating decreased to 23% of original pipeline steel X80, which improved by 10% than that of pipeline steel X80 with mono-layer Fe – Al coating. It cannot find obvious cracks and pits on the corrosion surface of pipeline steel X80 with Fe – Al / Al 2 O 3 duplex coating.

Microstructure and corrosion resistance of duplex coatings deposited on TC17 alloys by MAO and HiPIMS

2021 ◽  
pp. 130506
Author(s):  
Yulin Zhang ◽  
Fei Chen ◽  
You zhang ◽  
Menghao Liu ◽  
Yajie Pang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Duplex Coatings

Deposition of microarc oxidation–polycaprolactone duplex coating to improve the corrosion resistance of magnesium for biodegradable implants

2014 ◽  
Vol 562 ◽  
pp. 561-567 ◽  
Author(s):  
Long-Hao Li ◽  
T.S.N. Sankara Narayanan ◽  
Yu Kyoung Kim ◽  
Young-Min Kong ◽  
Il Song Park ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Microarc Oxidation ◽  
Biodegradable Implants ◽  
Duplex Coating

scholarly journals Corrosion protection of AZ91D magnesium alloy by a duplex coating

2020 ◽  
Vol 85 (10) ◽  
pp. 1317-1328
Author(s):  
López Forero ◽  
Ana Loperena ◽  
Ivana Lehr ◽  
Lorena Brugnoni ◽  
Silvana Saidman
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Antibacterial Properties ◽  
Silver Ions ◽  
Ringer Solution ◽  
Open Circuit ◽  
Duplex Coating ◽  
Alloy Az91d

A duplex coating was formed under potentiostatic conditions on magnesium alloy AZ91D in order to improve its corrosion resistance in a simulated physiological environment. The first layer was formed by anodization at low potentials in molybdate solution. The outer layer was a PPy film electrosynthesized in sodium salicylate solution. The conditions of the formation were determined to obtain a layer with globular morphology. The bilayer was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The corrosion protection properties of the coatings were examined in Ringer solution by monitoring the open circuit potential (OCP), polarization techniques, and electrochemical impedance spectroscopy (EIS). The obtained results showed that the bilayer improves the corrosion resistance of the substrate. Moreover, the duplex coating presented better anticorrosive properties than a single PPy film. Afterwards, the bilayer was modified by cementation of silver ions from a solution containing AgNO3. The modified electrode exhibited good antibacterial properties.

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