A self-healing polyurethane-based composite coating with high strength and anti-corrosion properties for metal protection

The selection of appropriate surface pretreatments is one of the pending issues for the industrial application of cerium-based chemical conversion coatings (CeCC) as an alternative for toxic chromate conversion coating (CrCC). A two-step surface pretreatment based on commercial products has been successfully used here to obtain CeCC on AA2024-T3 and AA7075-T6. Specimens processed for 1 to 15 min in solutions containing CeCl3 and H2O2 have been studied by scanning electron microscopy coupled with energy-dispersive X-ray analysis (SEM-EDX), glow discharge optical emission spectroscopy (GDOES), potentiodynamic linear polarization (LP), electrochemical impedance spectroscopy (EIS), and neutral salt spray (NSS) tests. SEM-EDX showed that CeCC was firstly observed as deposits, followed by a general coverage of the surface with the formation of cracks where the coating was getting thicker. GDOES confirmed an increase of the CeCC thickness as the deposition proceed, the formation of CeCC over 7075 being faster than over 2024. There was a Ce-rich layer in both alloys and an aluminum oxide/hydroxide layer on 7075 between the upper Ce-rich layer and the aluminum matrix. According to LP and EIS, CeCC in all samples offered cathodic protection and comparable degradation in chloride-containing media. Finally, the NSS test corroborated the anti-corrosion properties of the CeCC obtained after the commercial pretreatments employed.

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A self-healable, stretchable, tear-resistant and sticky elastomer enabled by a facile polymer blends strategy

Journal of Materials Chemistry A ◽

10.1039/d0ta11497a ◽

2021 ◽

Vol 9 (7) ◽

pp. 3931-3939

Author(s):

Shiqiang Song ◽

Honghao Hou ◽

Jincheng Wang ◽

Pinhua Rao ◽

Yong Zhang

Keyword(s):

Polymer Blends ◽

High Strength ◽

Self Healing ◽

Potential Applications ◽

Physical Blending

A high-stretchability, high-strength, tear-resistant, self-healing and adhesive elastomer is prepared through a facile and effective physical blending strategy. The elastomer shows potential applications in e-skin devices.

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One-step fabrication of hydrophobic yttria stabilized zirconia - Polytetrafluoroethylene – Silicone composite coating with considerable anti-wear and anti-corrosion properties

Vacuum ◽

10.1016/j.vacuum.2021.110184 ◽

2021 ◽

pp. 110184

Author(s):

Hao Xie ◽

Feng Guo ◽

Yangxi Song ◽

Lin Xiang ◽

Xingmao Xiao ◽

...

Keyword(s):

Composite Coating ◽

Yttria Stabilized Zirconia ◽

Stabilized Zirconia ◽

Corrosion Properties ◽

One Step

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Preparation and characterization of double network hydrogel with high-strength and self-healing

Materials Today Communications ◽

10.1016/j.mtcomm.2021.102450 ◽

2021 ◽

pp. 102450

Author(s):

Shubin Li ◽

Xiao Wang ◽

Jiang Zhu ◽

Zhenyu Wang ◽

Lu Wang

Keyword(s):

High Strength ◽

Self Healing ◽

Double Network

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Self-healing performance and corrosion resistance of phytic acid/cerium composite coating on microarc-oxidized magnesium alloy

Chemical Engineering Journal ◽

10.1016/j.cej.2021.131198 ◽

2021 ◽

pp. 131198

Author(s):

Shuaikang Yang ◽

Ruixue Sun ◽

Kezheng Chen

Keyword(s):

Corrosion Resistance ◽

Magnesium Alloy ◽

Composite Coating ◽

Phytic Acid ◽

Self Healing

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Self-Healing Polymer Network with High Strength, Tunable Properties, and Biocompatibility

Chemistry of Materials ◽

10.1021/acs.chemmater.1c00707 ◽

2021 ◽

Author(s):

Broden Diggle ◽

Zhen Jiang ◽

Rachel W. Li ◽

Luke A. Connal

Keyword(s):

Polymer Network ◽

High Strength ◽

Self Healing ◽

Tunable Properties

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Fatigue and Burst Analysis of Hy-140(T) Steel Pressure Vessels

Journal of Engineering for Industry ◽

10.1115/1.3427696 ◽

1970 ◽

Vol 92 (1) ◽

pp. 11-16 ◽

Cited By ~ 1

Author(s):

J. M. Barsom ◽

S. T. Rolfe

Keyword(s):

Yield Strength ◽

Pressure Vessel ◽

Low Cycle Fatigue ◽

High Strength Steels ◽

High Strength ◽

Fatigue Tests ◽

Pressure Vessels ◽

High Yield ◽

Corrosion Properties ◽

Burst Analysis

Increasing use of high-strength steels in pressure-vessel design has resulted from emphasis on decreasing the weight of pressure vessels for certain applications. To demonstrate the suitability of a 140-ksi yield strength steel for use in unwelded pressure vessels, HY-140(T)—a quenched and tempered 5Ni-Cr-Mo-V steel—was fabricated and subjected to various burst and fatigue tests, as well as to various laboratory tests. In general, results of the investigation indicated very good tensile, Charpy, Nil Ductility Transition Temperature (NDT), low-cycle fatigue, and stress-corrosion properties of HY-140(T) steels, as well as very good burst tests results, in comparison with existing high-yield strength pressure-vessel steels. The results also indicate that the HY-140(T) steel should be an excellent material for its originally designed purpose, Naval hull applications.

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