Inhibition of cut edge corrosion of coil-coated architectural cladding

Howard, R.L.; Zin, І. М.; Scantlebury, J.D.; Lyon, S.B.

doi:10.1016/s0300-9440(99)00059-4

Cited by 55 publications

(26 citation statements)

References 5 publications

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“…In the context of corrosion protection it has proved to be an effective means of increasing the life-span of the coating, enhancing the compatibility of the active agent with the coating matrix and sustaining, prolonging and controlling the release rate of the agent itself. In particular, as will be discussed later, the process of encapsulation has proved to be very useful in the case of corrosion inhibitors because it allowed coating scientists to solve some problems related to their chemical activity and solubility in water [18,[55][56][57][58]. This new class of coatings are commonly referred as "smart coatings" due to their ability to respond to physical, chemical or mechanical external stimuli, namely temperature, UV light, and pH changes, and they can be considered as an alternative mean to further enhance the corrosion protection and thereby the durability of metallic structures.…”

Section: Smart Coatingsmentioning

confidence: 99%

“…In fact, corrosion inhibitors can only provide the effectiveness if their solubility is in the right range, the so-called "window of solubility" [18,[55][56][57][58]. Corrosion inhibitors with too low solubility cause a lack of sufficient inhibiting ions available to diffuse from the matrix to the metal surface to protect.…”

Section: Self-releasing Inhibitor Coatingsmentioning

confidence: 99%

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6. Smart coatings for corrosion protection by adopting microcapsules

Palumbo¹

2015

Microencapsulation

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For decades, iron and steel have been two of the most important materials in our daily lives due to their good mechanical properties, availability and relatively reasonable cost. However, iron does not exist in nature as iron, but as a compound such as iron oxide. In order to get a usable material, these compounds must be refined and processed from their natural state. The conversion process (reduction, eq. 6.1) of iron from iron ore is undertaken by heating, therefore providing energy, with carbon under careful control, in order to prevent the reverse reaction. 2Fe 2 O 3 + 3C → 4Fe + 3CO 2 (6.1)According to the second law of thermodynamics [1, 2], there is a strong tendency for the system to move from order to disorder: its energy tends to be transformed from high energy states into lower levels energy states available, in order to reach the state of complete randomness and be unavailable for further work. Corrosion occurs due to this tendency of metals to recombine with components of the environment to reach its low energy state. In the case of iron, the metal tends to be oxidized into a reddish oxide, commonly known as rust, leading to a gradual destruction or deterioration of the metal [3-7]. All metals, with a few exceptions such as gold and silver, show this natural tendency to return to their lower energy state to form oxide and hydrate and therefore are prone to corrosion. Corrosion degradation is one of the main reasons for large industrial losses. One of the most suitable methods to protect metal for the external environment is the application of coatings on the metal's surface. Coatings are designed to protect the metal by physically isolating and preventing the diffusion of aggressive species towards the metal surface. However, coatings are prone to degrade, either because of the long exposure time -processes commonly known as weathering and ageing (e.g. moisture, UV radiation, thermo-oxidation, etc.) -or mechanical factors (e.g. damage due to impacts, scratches, defects, etc.). These chemical and mechanical degradation processes will eventually lead to the formation of microcracks and premature failure of the coating system. When the coating fails, the corrosion of the substrate is greatly accelerated. Repairs and maintenance of failed coatings are well-known to be both expensive and time consuming. Therefore, an active protection in addition to the time-limited passive protection is required. In order to prolong the service life of the metallic structures, scientists have developed a new class of intelligent polymeric coatings able to fully or partially regenerate their structural integrity resulting from external damage, without the help of any external Unauthenticated Download Date | 6/22/16 4:26 PM

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Section: Smart Coatingsmentioning

confidence: 99%

Section: Self-releasing Inhibitor Coatingsmentioning

confidence: 99%

6. Smart coatings for corrosion protection by adopting microcapsules

Palumbo¹

2015

Microencapsulation

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“…1,2) Chromates are reserved in paint layers and are eventually released [3][4][5][6][7][8][9] before being electrochemically reduced to chromium oxyhydroxide at corrosion sites, which acts as a corrosion inhibitor. [10][11][12] Atmospheric corrosion at and around the cut edges and scratches of painted galvanized steels is associated with several processes: 1) the galvanic corrosion of the Zn layer coupled with the steel substrate, 2) the release of…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Roles of Anti-corrosive Pigments in Sacrificial Corrosion Protection of Painted Galvanized Steel and their Relation to Organic Coating Delamination

et al. 2015

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“…[2][3][4] The paint system therefore acts as a physical barrier to moisture and corrosive species, and also provides a reservoir of inhibitor in the form of chromate that is available to heal defects in the paint system. 3,[5][6][7] Chromate inhibits corrosion by leaching from the paint system, diffusing through surface moisture, and reacting with actively corroding sites, thereby resulting in passivation. 5,8 While chromate has been shown to leach from conversion coatings, 9,10 the majority of chromate that leaches from the paint system comes from the primer.…”

mentioning

confidence: 99%

Characterization of a chromate-inhibited primer by doppler broadening energy spectroscopy

Scholes

Furman

Hughés

et al. 2006

J Coat. Technol. Res.

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A chromate-inhibited primer has been characterized by Doppler broadening energy spectroscopy (DBES), scanning electron microscopy (SEM), and Raman spectroscopy. The S-parameter obtained by DBES exhibited a three-layer depth profile, which is attributed to the presence of a "skin" layer in the polymer matrix of the primer and a concentration gradient in the inorganic phases distributed through the primer. The primer was also examined by DBES following immersion in solution. The change observed in the S-parameter upon immersion indicated water filling the molecular free volumes in the primer. The ability to monitor the depth of water uptake as a function of immersion time illustrates that the primer does not need to be fully saturated for chromate release to occur.

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Inhibition of cut edge corrosion of coil-coated architectural cladding

Cited by 55 publications

References 5 publications

6. Smart coatings for corrosion protection by adopting microcapsules

6. Smart coatings for corrosion protection by adopting microcapsules

Electrochemical Roles of Anti-corrosive Pigments in Sacrificial Corrosion Protection of Painted Galvanized Steel and their Relation to Organic Coating Delamination

Characterization of a chromate-inhibited primer by doppler broadening energy spectroscopy

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