Study of the Effect of Acid Atmospheres in Solar Reflectors Durability under Accelerated Aging Conditions

Fernández-García, Aranzazú; Díaz-Franco, R.; Ochoa-Martínez, Luz Araceli; Wette, Johannes

doi:10.1016/j.egypro.2014.03.177

Cited by 20 publications

(8 citation statements)

References 12 publications

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“…Some authors identified the degradation of silvered-glass reflectors exposed to several types of aggressive atmospheres using reflectance measurements and optical microscopy. Coyle in 1982 [33] tested 22 different glass second-surface mirrors using corrosive vapors (including H2S) in an environment with high relative humidity, and the most common failure modes were black corrosion spots found at localized sites, probably due to the penetration of moisture and corrosive gases through defects or pores in the paint layers, as also reported in recent studies using Kesternich tests [3,34]. Other typical degradation effects of silvered-glass reflectors are silver agglomeration [35][36][37][38], copper dissolution [35,39] and delamination or decohesion at the silver/glass interface [35,37,[39][40].…”

Section: Introductionsupporting

confidence: 61%

Corrosion on silvered-glass solar reflectors exposed to accelerated aging tests with polluting gases: A microscopic study

Garcia-Segura¹,

Fernández-García²,

Ariza

et al. 2020

Corrosion Science

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Silvered-glass solar reflectors consist of a reflective layer (RL), composed of silver and copper thin-films, back-protected by paint layers on a glass plate. The RL is prone to corrosion, especially in industrial atmospheres with polluting gases. After applying accelerated aging tests with gaseous pollutants (SO2, H2S, NO2), SG-R samples are studied by SEM and EDS, including FIB preparation. As expected the copper thin-film is firstly corroded, followed by the silver corrosion. Deposits of different corrosion products were found on the reflector's surface, depending on the polluting gas used. The rear protective paint layers also play an active role.

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Section: Introductionsupporting

confidence: 61%

Corrosion on silvered-glass solar reflectors exposed to accelerated aging tests with polluting gases: A microscopic study

Garcia-Segura¹,

Fernández-García²,

Ariza

et al. 2020

Corrosion Science

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“…Chemically robust superhydrophobic surfaces have many applications in both research and industry. For example acidic rain causes loss of water-repelling properties of self-cleaning solar cells because of chemical reactions between organic coatings and acids . Our approach can improve the efficiency of solar cells that are often located in industrial areas with high concentration of nitrogen oxide that produce nitric acid in acidic rains.…”

Section: Discussionmentioning

confidence: 99%

Robust Superhydrophobic Silicon without a Low Surface-Energy Hydrophobic Coating

Hoshian

Jokinen

Somerkivi

et al. 2014

ACS Appl. Mater. Interfaces

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Superhydrophobic surfaces without low surface-energy (hydrophobic) modification such as silanization or (fluoro)polymer coatings are crucial for water-repellent applications that need to survive under harsh UV or IR exposures and mechanical abrasion. In this work, robust low-hysteresis superhydrophobic surfaces are demonstrated using a novel hierarchical silicon structure without a low surface-energy coating. The proposed geometry produces superhydrophobicity out of silicon that is naturally hydrophilic. The structure is composed of collapsed silicon nanowires on top and bottom of T-shaped micropillars. Collapsed silicon nanowires cause superhydrophobicity due to nanoscale air pockets trapped below them. T-shaped micropillars significantly decrease the water contact angle hysteresis because microscale air pockets are trapped between them and can not easily escape. Robustness is studied under mechanical polishing, high-energy photoexposure, high temperature, high-pressure water shower, and different acidic and solvent environments. Mechanical abrasion damages the nanowires on top of micropillars, but those at the bottom survive. Small increase of hysteresis is seen, but the surface is still superhydrophobic after abrasion.

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“…In addition, industry is showing growing interest in the use of CSP technologies as the source of electricity, steam and process heat. However, these areas may face significant concentrations of sulfur dioxide (SO 2 ), which is the gas mainly responsible for atmospheric acidification [5]. This phenomenon, which has been of great concern in the last several years, has resulted in numerous studies [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…However, this is only a first step in lifetime prediction of solar reflector materials. To date, few solar reflector durability studies have succeeded in providing realistic lifetime estimates [21], and only a few of them have been devoted to the effect of humid sulfurcontaining atmospheres [5,22,23]. It is therefore considered a major issue that must be addressed and studied carefully.…”

Section: Introductionmentioning

confidence: 99%

Degradation of concentrating solar thermal reflectors in acid rain atmospheres

Garcia-Segura

Fernández-García

Ariza

et al. 2018

Solar Energy Materials and Solar Cells

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Given the importance that concentrating solar power technologies have had in recent years, the interaction between humid atmospheres in which SO 2 is the main pollutant and the metal reflecting layers of the solar concentrators is a major concern that should be addressed. Previous durability studies have urged the importance of designing an accelerated aging test protocol for simulating aggressive industrial atmospheres that solar reflector materials are bound to encounter. Therefore, three types of reflectors were tested in an acid-rain (or Kesternich) chamber at various temperatures and gas concentrations based on the DIN 50018 and ISO 6988 standards. The results showed the significant effect of high SO 2 concentrations rather than high temperatures on silvered-glass reflectors, although synergy should not be disregarded. Strong reductions in specular reflectance were found for one type of silvered reflector compared to another type, highlighting the significance of material processing and its effects on their final performance. Aluminum reflectors were not damaged as much as silvered-glass reflectors, but under microscopic inspection, a wide range of noticeable corrosion defects could be found in all the materials. Comparisons between the most representative Kesternich test and samples from an outdoor industrial site permitted realistic lifetime correlations for commercial silvered-glass reflectors.

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Study of the Effect of Acid Atmospheres in Solar Reflectors Durability under Accelerated Aging Conditions

Cited by 20 publications

References 12 publications

Corrosion on silvered-glass solar reflectors exposed to accelerated aging tests with polluting gases: A microscopic study

Corrosion on silvered-glass solar reflectors exposed to accelerated aging tests with polluting gases: A microscopic study

Robust Superhydrophobic Silicon without a Low Surface-Energy Hydrophobic Coating

Degradation of concentrating solar thermal reflectors in acid rain atmospheres

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