Durability of different selective solar absorber coatings in environments with different corrosivity

Diamantino, Teresa C.; Gonçalves, Rita; Nunes, Ana; Páscoa, Soraia; Carvalho, María Miguel

doi:10.1016/j.solmat.2017.03.004

Cited by 27 publications

(10 citation statements)

References 17 publications

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“…The results obtained with the methodology described in the standard ISO 21207:2015 (NSS + SO 2 + NO 2 +DW test), considering an accelerated aging test with cyclic variation of corrosion promoting gases (SO 2 and NO 2 ), higher humidity, salt spraying and drying, are similar to those presented by Diamantino et al 2017, with the same solar absorber coatings exposed to outdoor exposure testing sites with different corrosivity (urban test site with marine influence -medium corrosivity and an industrial/marine test site with very high /extreme corrosivity) in terms of the ranking of Pc, FM and anticorrosive protection.…”

Section: When Comparingsupporting

confidence: 74%

“…PC3 is a thickness insensitive spectrally selective (TISS) type paint coating (commercial name: SUNCOLOR PUR Black). Details of the surface preparation and paints application were already described (Diamantino et al 2017). The evaluated samples have a dimension of 65 × 65 mm and 65 ×140 mm.…”

Section: Selective Solar Absorber Coatingsmentioning

confidence: 99%

“…One is to study its durability on different natural exposure test sites (Slamova et al 2016) and, the other, is to develop accelerated aging test procedures in which the stress levels of one or more degradation factors are kept higher relative to in-use conditions (Carlsson et al 2004 andISO/TR 16335:2013). The study of the durability of different selective solar absorber coatings in natural exposure was already performed and published by the authors (Diamantino et al 2017) and is an important knowledge for the optimization of accelerated aging tests to be applied for qualification in terms of durability of the different solar absorber coatings.…”

Section: Introductionmentioning

confidence: 99%

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Accelerated Aging Tests for Solar Absorber Coatings

Diamantino¹,

Gonçalves²,

Páscoa³

et al. 2018

Proceedings of EuroSun 2018

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The need of a higher role of solar energy within the energy mix in the coming decades obliges the systems to increase their performance and reliability. It is demanded that the solar absorbers, as the key component of solar thermal systems, should be low cost with high efficiency for extended lifetimes under different kinds of environments. Commercially, there are two different types of solutions as selective solar absorbers coatings: coatings obtained by physical vapor deposition (PVD) and by paint coatings (PC). These coatings present different physical and chemical characteristics. Therefore, it is important to know how these coatings degrade over time in different environments. Results obtained with two different PVD coatings and three PC, under different accelerated aging tests, are presented. The aging tests performed included different environmental stress corrosion conditions: temperature, humidity, chlorides, sulphur dioxide and nitrogen oxides. Cyclic variation of corrosion promoting gases (sulfur dioxide and nitrogen dioxide), higher humidity, salt spraying and drying seem to be an aging test that reflects the different environments where the solar thermal collectors are exposed. In addition to the contaminants, drying / wetting cycles also play an important role in degradation mechanisms of absorber coatings.

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Section: When Comparingsupporting

confidence: 74%

Section: Selective Solar Absorber Coatingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Accelerated Aging Tests for Solar Absorber Coatings

Diamantino¹,

Gonçalves²,

Páscoa³

et al. 2018

Proceedings of EuroSun 2018

Self Cite

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show abstract

“…Furthermore, as the SSAC is exposed to air, corrosion will occur on the SSAC, which will inevitably have adverse effects on the solar absorptance and the thermal emittance of the SSAC, leading to dramatic degradation of the thermal performance of the solar collector. Solar thermal collectors have to withstand conditions like high temperatures, high humidity, ultraviolet irradiance, or wind and snow loads depending on the geographic position and atmospheric corrosivity [3][4][5][6][7][8][9]. As the key component of a solar thermal collector, the optical properties of SSACs are negatively affected by such conditions [3].…”

Section: Introductionmentioning

confidence: 99%

“…Solar thermal collectors have to withstand conditions like high temperatures, high humidity, ultraviolet irradiance, or wind and snow loads depending on the geographic position and atmospheric corrosivity [3][4][5][6][7][8][9]. As the key component of a solar thermal collector, the optical properties of SSACs are negatively affected by such conditions [3]. Hence, the main challenges faced by research and development of SSACs are to improve the optical properties, but at the same time to enhance reliability and durability [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

An experimental study on the effect of salt spray testing on the optical properties of solar selective absorber coatings produced with different manufacturing technologies

Chen

Gao

Liu

et al. 2019

Int J Energy Environ Eng

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Solar selective absorber coating (SSAC) is one of the key components of a solar collector, with its optical properties having a significant impact on the collector's thermal performance. The key parameters characterizing the optical properties of an SSAC are the solar absorptance (absorptance of solar radiation) and the thermal emittance (emittance for long-wave radiation). However, some of high-performing SSACs suffer from some drawbacks, such as lower durability, lower resistance to corrosion and abrasion, which is particularly harmful for SSACs, as, for example, chlorides in the atmosphere have become a main contributor to corrosion in coastal areas with the increasing trend of global warming. In this paper, salt spray tests have been conducted on the SSACs manufactured by three common manufacturing technologies, i.e., the anode oxidation (AO) technology, the vacuum magnetron sputtering (VMS) technology, and the black chromium plating (BCP) technology, over the testing durations of 12 h, 24 h, 36 h, and 48 h, respectively, to examine the effect of the salt spray testing on the optical properties of SSACs manufactured by different manufacturing technologies. The salt spray testing is an accelerated aging testing method for evaluating the SSAC's resistance to corrosion when it is under an extended exposure to a saline, or salted, spray (fog). The experimental results show that, in general, the SSACs manufactured by the BCP technology have excellent resistance to salt spray (i.e., to corrosion) and those manufactured by the AO technology have only reasonable resistance to corrosion, whereas the SSACs manufactured by the VMS technology have very poor resistance to corrosion. The results also demonstrate that there are noticeable differences in the optical properties of the SSAC samples even manufactured by the same technology but by different manufacturers, with some having significant differences. The causes for the differences have been further examined through the inspection of the physical appearance of the selected SSAC samples and the experimentally measured distributions of the monochromatic reflectance of solar radiation of the samples over the solar spectrum before and after the salt spray testing over different durations.

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Alternative and emerging storage practices and technologies

Thorpe¹

2022

Storage of Cereal Grains and Their Products

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Durability of different selective solar absorber coatings in environments with different corrosivity

Cited by 27 publications

References 17 publications

Accelerated Aging Tests for Solar Absorber Coatings

Accelerated Aging Tests for Solar Absorber Coatings

An experimental study on the effect of salt spray testing on the optical properties of solar selective absorber coatings produced with different manufacturing technologies

Alternative and emerging storage practices and technologies

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