The effect of corrosion inhibitors on environmental fatigue crack growth in Al–Zn–Mg–Cu

Dorman, Sarah E. Galyon; Reid, Timothy A.; Hoff, Benjamin K.; Henning, Daniel H.; Collins, Sarah E.

doi:10.1016/j.engfracmech.2014.12.009

Cited by 5 publications

(4 citation statements)

References 14 publications

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“…Corrosion inhibitors can be released after deformation or fracture to form an anti-diffusion thin coating over the damaged region. Though chromium compounds are effective corrosion-inhibiting materials because of their ability to slow crack growth, they are considered to be environmentally unsafe [ 21 ]. The addition of microcapsules can improve the corrosion-inhibition properties while maintaining environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

Self-Healing Poly(urea formaldehyde) Microcapsules: Synthesis and Characterization

Kothari

Iroh

2023

Polymers

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Smart coatings and smart polymers have been garnering great interest in recent times due to their novel characteristics, such as being self-restoring, self-cleaning, and self-healing. However, most self-healing materials have a low glass transition temperature (Tg) and are inadequate for the repair of advanced composites. Because of their low Tg, the conventional self-healing materials plasticize and weaken the composites. In this study, moderate to high temperature self-healing microcapsules, capable of healing and thus stopping crack propagation, are prepared. The microcapsules were prepared using a two-step process involving the synthesis of poly(urea formaldehyde) (PUF) prepolymer, followed by the encapsulation of hexamethylene diisocyanate (HDI) in an oil-in-water emulsion to form a crosslinked PUF shell. Diisocyanates are of particular interest as self-healing encapsulants because of their diversity of structure and fast rate of hydrolysis. Successful encapsulation was verified by Fourier transform infrared spectroscopy (FTIR) and optical microscopy. Thermogravimetric analysis (TGA) was used to characterize the thermal properties of microcapsules. The onset temperature for microcapsule degradation varied from 155 °C to 195 °C. Dynamic mechanical analysis (DMA) was used to determine the thermomechanical response of microcapsule/epoxy films. DMA showed that the glass transition temperature (Tg) of the epoxy/microcapsule composite was greater than the Tg for neat epoxy and varied between 34 and 65 °C. The TGA analysis of the epoxy/microcapsule composite shows that the thermal stability and char retention of the epoxy/microcapsule composite increased and the low temperature decomposition peak at 150 °C, associated with the microcapsule, disappeared after the DMA test, indicating the occurrence of a reaction between HDI and the epoxy to form a crosslinked polyurea network structure.

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Section: Introductionmentioning

confidence: 99%

Self-Healing Poly(urea formaldehyde) Microcapsules: Synthesis and Characterization

Kothari

Iroh

2023

Polymers

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“…There have been many research reports on natural products as corrosion inhibitors in different aggressive environments [14][15][16]. In fatigue tests on 7xxx series aluminum alloys many researchers have shown that fatigue crack growth rate slows down at high levels of chromate additions [17], [18]. Laboratory corrosion-fatigue tests can be classified as either cycles-to-failure (complete fracture) or crack propagation (crack growth) tests.…”

Section: ‫ي‬ ‫عرض‬mentioning

confidence: 99%

The Corrosion Inhibition Effect on Fatigue Behavior for Aluminum Alloy 5052 in the Saline Environment

Eldwaib,

Aldarwish,

Ballem

et al. 2022

JOPAS

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The corrosion inhibition of Al alloys is the subject of huge technological importance wing to the use of these alloys in wide industrial applications. Fatigue life (number of cycles to failure Nf) for Al-Mg alloy in 3.5% NaCl at different acidity and alkalinity and 3.5% NaCl (pH=1) with inhibitors was investigated in this study. The inhibitors were composed mainly of phosphate, adding a certain proportion of other nontoxic inhibitors to select alternatives to environmentally hazardous chromate. Fatigue behavior was studied by using the corrosion fatigue machine with plane-bending mode. The large difference between the fatigue life in the corrosive mediums, such as NaCl, and that in dry air is noticed. The results showed that in 3.5% NaCl without inhibitor, the minimum fatigue life is obtained at pH=1, where the media is too aggressive (extremely acidic), whereas the highest value is obtained at pH=5 where the very low solubility of oxide film on the alloy. As the concentration of inhibitor increased the number of cycles was increased as well. The scanning electron microscope (SEM) had conducted on the surface morphology and fracture section of the specimens for characterizing.

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“…Inhibitors are typically designed to last around 6 to 8 years, in other words, at least until the next maintenance period. Organic coatings typically absorb water via defects into pores within the coating whereby inhibitor pigments may then dissociate and dissolve [45]. Triazole and thiazole are generally used as corrosion inhibitors for aluminum, especially in lieu of toxic chromium-based anticorrosive agents.…”

Section: Shape Memory Composites: Coating Additivesmentioning

confidence: 99%

“…2-Mercaptobenzothiazole (MBT) is favored as it adsorbs to aluminum alloy surfaces to form a thin, protective film; however, MBT and other corrosion inhibitors do not work well with a polymer coating as they can deactivate and do not provide the desired corrosion protection [46]. Chromate coatings are the baseline corrosion inhibitor, and high levels can slow the crack growth rate but can be considered environmentally harmful [45]. Adding micro-or nanocapsules has the possibility of reducing the barrier properties depending upon the size of the container or if the container is incompatible with the matrix.…”

Section: Shape Memory Composites: Coating Additivesmentioning

confidence: 99%

Shape Memory Corrosion-Resistant Polymeric Materials

Jacobson

Iroh

2021

International Journal of Polymer Science

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Shape memory alloys, materials capable of being deformed and maintaining the deformation and additionally capable of returning to the initial position, are valued for a range of applications from actuators to flexible microdevices. Maintaining the properties that make them useful, their ability to deform and reform, requires that shape memory alloys must be protected against corrosion, in which the integration of shape memory polymers can act as a means of protection. Thus, this review is to highlight the utility of self-healing shape memory polymers as a means of corrosion inhibition. Therefore, this review discusses the benefits of utilizing self-healing shape memory polymers for the protection of shape memory, several types of self-healing polymers that could be used, means of improving or tailoring the polymers towards specific usages, and future prospects in designing a shape memory polymer for use in corrosion inhibition.

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The effect of corrosion inhibitors on environmental fatigue crack growth in Al–Zn–Mg–Cu

Cited by 5 publications

References 14 publications

Self-Healing Poly(urea formaldehyde) Microcapsules: Synthesis and Characterization

Self-Healing Poly(urea formaldehyde) Microcapsules: Synthesis and Characterization

The Corrosion Inhibition Effect on Fatigue Behavior for Aluminum Alloy 5052 in the Saline Environment

Shape Memory Corrosion-Resistant Polymeric Materials

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