Photovoltaic Panel Salt Spray Environmetal Test
April 16, 2021
Photovoltaic (PV) modules are electrical equipment used for continuous outdoor exposure during their life cycle. Under some special geographic conditions, such as: salt-alkali land, coastal areas and other places, the highly corrosive humid atmosphere may eventually lead to some photovoltaic module components (corrosion of metal parts, deterioration of the performance of some non-metallic materials.
Such as protective coatings and Backplane) through the long-term assimilation of salt-containing tiny droplets in the atmosphere to cause sexual damage, which in turn affects its working performance. Salt spray corrosion is the most common and most destructive atmospheric corrosion.
Therefore, PV panels need to be tested for performance, aging, cracking, durability and other properties before they are put into the market
The apparatus for salt spray testing is to consists of a chamber with inside measurement of 48 in by 30 in by 36 in (1.22 m by 0.76 m by 0.91 m) or larger if required;
A salt solution reservoir; a supply of conditioned compressed air;
One dispersion tower constructed in accordance with ASTM designation B117-97, for producting a salt spray;
Provision for heating chamber;
And necessary means of control.
A) The salt solution is to consist of 5% by weight of common salt (sodium chloride) in distilled water. The pH value of the collected solution is to be between 6.5 and 7.2, and have a specific gravity between 1.026 and 1.040 at 95°F (35°C). The temperature of the chamber is to be maintained within the range of 92°F to 97°F (35°C-36°C) throughout the test.
B) The test sample is to be supported on plastics racks at an angle of 15 degrees from the vertical.
C) Drops of solution which accumulate on the ceiling or cover of the chamber are to be diverted from dripping on the specimen. Drops of solution which fall from the specimen are not to be recirculated, but are to be removed by a drain located in the bottom of the apparatus.
D) Reference specimens, 4 in by 12 in (102 mm by 305 mm) commercial zinc coated sheet steel are to be used for comparison. The selected specimens are to be represent of the minimum acceptable amount of zinc coating under requirements for G90 or G60 coating designation (as appliable, see accessibility of Uninsulated Parts, Section 15) as determined in accordance with standard test method for weight of coating on zinc-coated iron or steel articles, ASTM A90-81(1991) such zinc coatings are considered as providing acceptable protection against corrosion.
E) The zinc coated reference specimen are to be cleaned with soap and water, rinsed with ethyl alcohol and ethyl ether, dried, blade, and the cut edges protected with pain, wax or other effective medium before being placed in the salt spray chamber.
F) Both the reference specimen and samples under test are to be scribed with a single groove approximately 6 in (152m) long, to expose the underlying steel.
G) The test is to continue until the coating on the test sample or reference samples are broken down and corrosion products are formed on the underlying steel.