scholarly journals Double layered Polymeric Coatings for Corrosion Protection of Steel

2021 ◽  
Author(s):  
Amani Hassanein ◽  
Adnan Khan ◽  
R.A. Shakoor ◽  
Ramazan Kahraman
Keyword(s):  
Corrosion Protection ◽  
Linseed Oil ◽  
Steel Substrate ◽  
Urea Formaldehyde ◽  
Bottom Layer ◽  
Halloysite Nanotubes ◽  
Industrial Applications ◽  
Economic Losses ◽  
Self Healing ◽  
Polymeric Coatings

Corrosion is one of the challenging issues faced by many industries, causing substantial economic losses every year due to the degradation of metallic parts, raising many safety concerns. Therefore, it is of utmost relevance to developing strategies that can repair the damaged part of the coatings to protect the base metal and restrict the initiation of corrosion. Towards this direction, the concept of double-layered polymeric coatings (DLPCs) for corrosion protection is introduced as a novel strategy to bring different healing functionalities into coating matrices. The developed DLPCs are composed of a top layer containing 5wt. % of melamine urea-formaldehyde microcapsules (MUFMC) encapsulating boiled linseed oil (self-healing agent), and bottom layer having 3wt. % benzotriazole (corrosion inhibitor) loaded into halloysite nanotubes (HNTs). The DLPCs were developed on mild steel substrate employing a doctor blade technique. The electrochemical analyses indicates that the DLPCs demonstrate improved corrosion resistant properties. This improved performance can be ascribed to the efficient triggering of the individual carriers in the quarantined matrix, resulting in enhanced corrosion efficiency of the DLPCs. The promising characteristics of DLPCs make them suitable for many potential industrial applications.

scholarly journals Self-Healing Performance of Multifunctional Polymeric Smart Coatings

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1519 ◽  
Author(s):  
Sehrish Habib ◽  
Adnan Khan ◽  
Muddasir Nawaz ◽  
Mostafa Sliem ◽  
Rana Shakoor ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Linseed Oil ◽  
Steel Substrate ◽  
Urea Formaldehyde ◽  
Nanocomposite Coatings ◽  
Self Healing ◽  
Ph Change ◽  
Polymeric Nanocomposite ◽  
Smart Coatings ◽  
Healing Agent

Multifunctional nanocomposite coatings were synthesized by reinforcing a polymeric matrix with halloysite nanotubes (HNTs) loaded with corrosion inhibitor (NaNO3) and urea formaldehyde microcapsules (UFMCs) encapsulated with a self-healing agent (linseed oil (LO)). The developed polymeric nanocomposite coatings were applied on the polished mild steel substrate using the doctor’s blade technique. The structural (FTIR, XPS) and thermogravimetric (TGA) analyses reveal the loading of HNTs with NaNO3 and encapsulation of UFMCs with linseed oil. It was observed that self-release of the inhibitor from HNTs in response to pH change was a time dependent process. Nanocomposite coatings demonstrate decent self-healing effects in response to the external controlled mechanical damage. Electrochemical impedance spectroscopic analysis (EIS) indicates promising anticorrosive performance of novel nanocomposite coatings. Observed corrosion resistance of the developed smart coatings may be attributed to the efficient release of inhibitor and self-healing agent in response to the external stimuli. Polymeric nanocomposite coatings modified with multifunctional species may offer suitable corrosion protection of steel in the oil and gas industry.

scholarly journals Hybrid Microcapsules Reinforced Smart Coatings for Corrosion Protection in Oil and Gas Industry

2020 ◽  
Author(s):  
Adnan Khan ◽  
Amani Hassanein ◽  
Abdul Shakoor ◽  
Ramazan kahraman ◽  
Fatima Montemor ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Epoxy Resin ◽  
Corrosion Protection ◽  
Oil And Gas ◽  
Steel Substrate ◽  
Urea Formaldehyde ◽  
Polymeric Coating ◽  
Layer By Layer ◽  
Self Healing ◽  
Linalyl Acetate

Corrosion is one of the critical causes of material loss in metal components. This research is focused on the synthesis, and electrochemical properties of polyelectrolyte layered microcapsules (PMCs) reinforced smart polymeric coating for corrosion protection of steel substrates. For this purpose, monolayer urea-formaldehyde microcapsules encapsulated with linalyl acetate (MLMCs) was synthesized by Insitu polymerization. In the next step, phenylthiourea (PTU) was loaded between the layers of polyelectrolytes; polyethylenimine (PEI) & sulfonated polyether ether ketone (SPEEK) on the surface of MLMCs using layer by layer technique. The MLMCs are sensitive to mechanical stress while the PTU in PMCs is triggered by pH stimulus. The newly designed PMCs has linalyl acetate in the core and PTU in the polyelectrolyte layers. Furthermore, 6 wt.% of both MLMCs and PMCs are dispersed in the epoxy resin and applied on the clean steel substrate. Performance comparison showed that the epoxy resin reinforced with PMCs demonstrate enhanced thermal, self-healing and electrochemical properties. This improved performance can be attributed to the efficient release of the self-healing agent and corrosion inhibitor from the PMCs. Conclusively, the epoxy coatings modified with PMCs can be a novel organic coating for the corrosion protection of oil and gas industries.

scholarly journals Cerium Stearate Electrodeposited Superhydrophobic Coatings for Active Corrosion Protection of Anodized AA 2024-T3

CORROSION ◽  
10.5006/3799 ◽  
2021 ◽  
Author(s):  
Abirami S ◽  
Bharathidasan T ◽  
Sathiyanarayanan Sadagopan ◽  
Arunchandran Chenan
Keyword(s):  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Industrial Applications ◽  
Environmental Stability ◽  
Process Time ◽  
Self Healing ◽  
Water Contact ◽  
Electrodeposition Time ◽  
Aa 2024 ◽  
Active Corrosion

The present study investigated the active corrosion protection provided by superhydrophobic cerium stearate coatings. Superhydrophobic cerium stearate was deposited on anodized AA 2024-T3 at 40 V with different electrodeposition times using a simple DC electrodeposition technique to know the role of electrodeposition time on surface morphology, hydrophobicity, and corrosion resistance. We characterized the structure and morphology of cerium stearate to understand its formation mechanism. Electrodeposition process at 40 V for 120 min resulted in the formation of dual scale Allium giganteum like micro/nano hierarchical texture of cerium stearate with a water contact angle (WCA) of 165 ± 1.6°. The cerium stearate coating obtained for 120 min process time had excellent self-cleaning property and good chemical stability, environmental stability, and mechanical durability acceptable for industrial applications. Electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET) were used to investigate the active corrosion protection of cerium stearate coating. The electrodeposited cerium stearate coating showed active corrosion protection based on self-healing ability by releasing cerium (Ce3+) ions.

scholarly journals Self-Healing Performance of Smart Polymeric Coatings Modified with Tung Oil and Linalyl Acetate

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1609
Author(s):  
Norhan Ashraf Ismail ◽  
Adnan Khan ◽  
Eman Fayyad ◽  
Ramazan Kahraman ◽  
Aboubakr M. Abdullah ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
In Situ Polymerization ◽  
Urea Formaldehyde ◽  
Average Particle Size ◽  
Average Particle ◽  
Self Healing ◽  
Polymeric Coatings ◽  
Linalyl Acetate ◽  
Tung Oil ◽  
Smart Coatings

This work focuses on the synthesis and characterization of polymeric smart self-healing coatings. A comparison of structural, thermal, and self-healing properties of two different polymeric coatings comprising distinct self-healing agents (tung oil and linalyl acetate) is studied to elucidate the role of self-healing agents in corrosion protection. Towards this direction, urea-formaldehyde microcapsules (UFMCs) loaded with tung oil (TMMCs) and linalyl acetate (LMMCs) were synthesized using the in-situ polymerization method. The synthesis of both LMMCs and TMMCs under identical experimental conditions (900 rpm, 55 °C) has resulted in a similar average particle size range (63–125 µm). The polymeric smart self-healing coatings were developed by reinforcing a polymeric matrix separately with a fixed amount of LMMCs (3 wt.% and 5 wt.%), and TMMCs (3 wt.% and 5 wt.%) referred to as LMCOATs and TMCOATs, respectively. The development of smart coatings (LMCOATs and TMCOATs) contributes to achieving decent thermal stability up to 450 °C. Electrochemical impedance spectroscopy (EIS) analysis indicates that the corrosion resistance of smart coatings increases with increasing concentration of the microcapsules (TMMCs, LMMCs) in the epoxy matrix reaching ~1 GΩ. As a comparison, LMCOATs containing 5 wt.% LMMCs demonstrate the best stability in the barrier properties than other developed coatings and can be considered for many potential applications.

scholarly journals Synthesis of Urea Formaldehyde microcapsules containing linseed oil for self-healing coating

2016 ◽  
Vol 19 (4) ◽  
pp. 50-57
Author(s):  
Ha Thi Thai La ◽  
Tinh Dinh Cong Vo
Keyword(s):  
Emulsion Polymerization ◽  
Sodium Dodecyl Sulphate ◽  
Linseed Oil ◽  
Urea Formaldehyde ◽  
Sodium Dodecyl ◽  
Agitation Rate ◽  
Self Healing ◽  
The Core ◽  
Average Size

Microcapsules had Urea Formaldehyde (UF) shell and linseed oil core were investigated manufacture. Synthesis UF shell of Microcapsules was experimented by emulsion polymerization and pH was only adjusted once by mixer of Resorcinol / Amoni Clorua. Content of Urea and emulsifiler Sodium Dodecyl Sulphate, pH, agitation rate were investigated. This research shows that the linseed oil (core) is disintegrated at 1,500 rpm in pH = 5.5 with 1.2% (w/w) Sodium Dodecyl Sulphate. In addition, the combination of Urea used in order to create the shell about 40% (w/w) linseed oil and Formaldehyde are suitable. The microcapsules products have the average size less 100 μm. Besides that, the content of the linseed oil in the core is about 87% (w/w)take the advantage to use in self-healing coating.

scholarly journals Self-Healing Coatings Based on Linseed-Oil-Loaded Microcapsules for Protection of Cementitious Materials

Coatings ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 404 ◽  
Author(s):  
Dong-Min Kim ◽  
In-Ho Song ◽  
Ju-Young Choi ◽  
Seung-Won Jin ◽  
Kyeong-Nam Nam ◽  
...  
Keyword(s):  
Protective Coating ◽  
Linseed Oil ◽  
Urea Formaldehyde ◽  
Cementitious Materials ◽  
The Self ◽  
Wall Material ◽  
Self Healing ◽  
Sorptivity Test ◽  
Coating Formulation ◽  
Coating Formulations

Linseed oil undergoes an oxidative drying reaction upon exposure to air, resulting in a soft film. The reaction conversion after 48 h reached 88% and 59% when it reacted at room temperature and −20 °C, respectively. Linseed-oil-loaded microcapsules were prepared using a urea-formaldehyde polymer as the shell wall material. The microcapsules were integrated into a commercially available protective coating formulation to prepare self-healing coating formulations with different capsule loadings. The coating formulations were applied on mortar specimens to prepare self-healing coatings. The effect of capsule loading on adhesion strength of the self-healing coating was studied. The self-healing function of the coating was investigated by SEM, a water sorptivity test and an accelerated carbonation test. Successful self-healing was demonstrated for both scratch and crack damage in the coatings. Low-temperature self-healing was demonstrated with a saline solution sorptivity test conducted at −20 °C. The linseed-oil-based microcapsule-type self-healing coating system is a promising candidate as a protective coating for cementitious materials.

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