Self-Healing Coatings to Mitigate Post-Impact Corrosion

CORROSION ◽  
10.5006/2382 ◽  
2017 ◽  
Vol 73 (9) ◽  
pp. 1091-1097 ◽  
Author(s):  
Atousa Plaseied ◽  
Allen Skaja ◽  
Ramanathan Lalgudi ◽  
Christine Henderson
Keyword(s):  
Service Life ◽  
Exposure Period ◽  
Metal Substrate ◽  
The Self ◽  
Coating System ◽  
Self Healing ◽  
Polymeric Coatings ◽  
Metallic Structures ◽  
Post Impact ◽  
Salt Fog

Self-healing polymeric coatings have offered tremendous potential for repairing damage and extending the service life and safety of metallic structures. There have been many challenges associated with the catalyst activated version of the self-healing oligomer filled microcapsule coating additives (or microbeads) technology, but a non-catalyst version appears more promising. The objective of this study was to identify the effect of self-healing coatings in an epoxy coating system containing the non-catalyst microbeads on post-impact corrosion mitigation of water infrastructure. Experimental results showed that coatings containing microbeads did not fully prevent corrosion of the post-impact exposed metal substrate over the exposure period for this study, especially in salt fog and immersion conditions. However, this coating showed less coating degradation compared to the coating without the presence of microbeads.

Self-Healing Polymers and Composites: Extrinsic Routes

2021 ◽  
Vol 18 ◽  
Author(s):  
Nidhi Agrawal ◽  
Bharti Arora
Keyword(s):  
Electronic Devices ◽  
Covalent Bond ◽  
Polymeric Materials ◽  
The Self ◽  
Self Healing ◽  
Polymeric Coatings ◽  
Optical Sensitivity ◽  
Artificial Materials ◽  
Commercial Scale ◽  
End Products

: Polymers have the property to convert the physical stress to covalent bond shuffling thereby acting as the healing agents. Polymeric coatings, paints, electronic devices, drug delivery and many other applications find self-healing materials as a smart technique to prolong the life cycle of the end products. The idea behind these artificial materials is to make it behave like the human body. It should sense the failure and repair before it becomes worse or irreparable. Researchers have explored several polymeric materials which can self-heal through intrinsic or extrinsic mechanisms. This review specifically focusses on extrinsic routes governed by mechanical stress, temperature change in covalent bond, humidity, variation in pH, optical sensitivity and electrochemical effects. Each possible mechanism is further supported by the molecules or bonds which can undergo the transformations under given conditions. On a broader scale, bonds that can self-repair by mechanical force, thermal treatment, chemical modifications, UV irradiation, or electromagnetic phenomenon, are covered under this review. It brings into notice of the shortcomings or challenges in adopting the technology to the commercial scale. The possible molecules or bonds which can undergo the self-healing under certain conditions has been distinctly presented in a well-segregated manner. This review is envisaged to act as a guide for researchers working in this area.

Equipment-free photothermal effect promoted self-healing and self-recovery of hydrogels

Soft Matter ◽  
2020 ◽  
Vol 16 (43) ◽  
pp. 9833-9837
Author(s):  
Xinjie Zhang ◽  
Xuechen Liang ◽  
Qichen Huang ◽  
Han Zhang ◽  
Changkun Liu ◽  
...  
Keyword(s):  
Service Life ◽  
Soft Materials ◽  
The Self ◽  
Photothermal Effect ◽  
Self Healing ◽  
Synthetic Process ◽  
Self Repair

The self-repair of hydrogel materials can be promoted under sunlight by adding a light-to-heat conversion substance during the synthetic process, which will greatly extend the service life of soft materials in the off-grid areas.

Experimental studies on the development of a self-healing cementitious matrix for repair and retrofitting of concrete structures

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Dibyendu Adak ◽  
Donkupar Francis Marbaniang ◽  
Subhrajit Dutta
Keyword(s):  
Service Life ◽  
Mechanical Strength ◽  
Concrete Structure ◽  
Concrete Structures ◽  
The Self ◽  
Self Healing ◽  
Content Type ◽  
Cementitious Matrix ◽  
Healing Period ◽  
Strength And Durability

PurposeSelf-healing concrete is a revolutionary building material that will generally reduce the maintenance cost of concrete constructions. Self-healing of cracks in concrete structure would contribute to a longer service life of the concrete and would make the material more durable and more sustainable. The cementitious mortar with/without incorporating encapsulates at different percentages of slag replacement with the cement mix improves autogenous healing at different ages. Therefore, this study’s aim is to develop a self-healing cementitious matrix for repair and retrofitting of concrete structures.Design/methodology/approachIn the present work, waste straw pipes are used as a capsule, filled with the solution of sodium hydroxide (NaOH), sodium silicate (Na2SiO3) and colloidal nano-silica as self-healing activators. An artificial micro-crack on the control and blended mortar specimens at different percentages of slag replacement with cement (with/without encapsulation) is developed by applying a compressive load of 50% of its ultimate load-carrying capacity. The mechanical strength and ultrasonic pulse velocity, water absorption and chloride ion penetration test are conducted on the concrete specimen before and after the healing period. Finally, the self-healing activity of mortar mixes with/without encapsulation is analysed at different ages.FindingsThe encapsulated mortar mix with 10% of slag content has better self-healing potential than all other mixes considering mechanical strength and durability. The enhancement of the self-healing potential of such mortar mix is mainly due to hydration of anhydrous slag on the crack surface and transformation of amorphous slag to the crystalline phase in presence of encapsulated fluid.Research limitations/implicationsThe self-healing activities of the slag-based cementitious composite are studied for a healing period of 90 days only. The strength and durability performance of the cracked specimen may be increased after a long healing period.Practical implicationsThe outcome of the work will help repair the cracks in the concrete structure and enhances the service life.Originality/valueThis study identifies the addition encapsulates with a self-healing activator fluid that can recover its strength after minor damage.

scholarly journals Physical Properties of Electropolished CoCrMo Alloy Coated with Biodegradable Polymeric Coatings Releasing Heparin after Prolonged Exposure to Artificial Urine

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2551
Author(s):  
Wojciech Kajzer ◽  
Janusz Szewczenko ◽  
Anita Kajzer ◽  
Marcin Basiaga ◽  
Joanna Jaworska ◽  
...  
Keyword(s):  
Physical Properties ◽  
Crevice Corrosion ◽  
Mass Density ◽  
Polymer Coatings ◽  
Metal Substrate ◽  
Reference Level ◽  
Polymeric Coatings ◽  
Initial State ◽  
Cocrmo Alloy ◽  
Artificial Urine

In this study, we aimed to determine the effect of long-term exposure to artificial urine on the physical properties of CoCrMo alloy with biodegradable heparin-releasing polymeric coatings. Variants of polymer coatings of poly(L,L-lactide-ɛ-caprolactone) (P(L,L-L/CL)) and poly(D,L-lactide-ɛ-caprolactone) (P(D,L-L/CL)) constituting the base for heparin-releasing (HEP) polyvinyl alcohol (PVA) coatings were analyzed. The coatings were applied by the dip-coating method. Heparin was used to counteract the incrustation process in the artificial urine. The study included tests of wettability, resistance to pitting and crevice corrosion, determination of the mass density of metal ions penetrating into the artificial urine, and the kinetics of heparin release. In addition, microscopic observations of surface roughness and adhesion to the metal substrate were performed. Electrolytically polished CoCrMo samples (as a reference level) and samples with polymer coatings were used for the tests. The tests were conducted on samples in the initial state and after 30, 60, and 90 days of exposure to artificial urine. The analysis of the test results shows that the polymer coatings contribute by improving the resistance of the metal substrate to pitting and crevice corrosion in the initial state and reducing (as compared with the metal substrate) the mass density of metal ion release into the artificial urine. Moreover, the PVA + HEP coating, regardless of the base polymer coatings used, contributes to a reduction in the incrustation process in the first 30 days of exposure to the artificial urine.

scholarly journals Effect of fly ash on the self-healing capability of cementitious materials with crystalline admixture under different conditions

AIP Advances ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 075018
Author(s):  
Xi Wang ◽  
Hao Qiao ◽  
Ziwei Zhang ◽  
Shiying Tang ◽  
Shengjun Liu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Cementitious Materials ◽  
The Self ◽  
Self Healing

scholarly journals The Effect of Superabsorbent Polymers on the Microstructure and Self-Healing Properties of Cementitious-Based Composite Materials

2021 ◽  
Vol 11 (2) ◽  
pp. 700
Author(s):  
Irene A. Kanellopoulou ◽  
Ioannis A. Kartsonakis ◽  
Costas A. Charitidis
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Hybrid Structure ◽  
The Self ◽  
Self Healing ◽  
Cementitious Composite ◽  
Superabsorbent Polymers ◽  
Porosity Reduction ◽  
Environment Control ◽  
The Impact

Cementitious structures have prevailed worldwide and are expected to exhibit further growth in the future. Nevertheless, cement cracking is an issue that needs to be addressed in order to enhance structure durability and sustainability especially when exposed to aggressive environments. The purpose of this work was to examine the impact of the Superabsorbent Polymers (SAPs) incorporation into cementitious composite materials (mortars) with respect to their structure (hybrid structure consisting of organic core—inorganic shell) and evaluate the microstructure and self-healing properties of the obtained mortars. The applied SAPs were tailored to maintain their functionality in the cementitious environment. Control and mortar/SAPs specimens with two different SAPs concentrations (1 and 2% bwoc) were molded and their mechanical properties were determined according to EN 196-1, while their microstructure and self-healing behavior were evaluated via microCT. Compressive strength, a key property for mortars, which often degrades with SAPs incorporation, in this work, practically remained intact for all specimens. This is coherent with the porosity reduction and the narrower range of pore size distribution for the mortar/SAPs specimens as determined via microCT. Moreover, the self-healing behavior of mortar-SAPs specimens was enhanced up to 60% compared to control specimens. Conclusively, the overall SAPs functionality in cementitious-based materials was optimized.

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