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- W2993607106 abstract "The effects of moisture content, temperature and pollutant mixture on atmospheric corrosion of copper and silver were investigated by exposing test specimens to different environmental conditions, followed by surface characterization using the coulometric reduction, Scanning Electron Microscopy and Energy Dispersive Spectrometry (SEM/EDS). Printed circuit board test cards (PCBs) with bare copper were also used to investigate the effects of voltage bias on the PCBs on the corrosion rate. The test specimens were exposed to mixed flowing gases (MFG) environment with 8 different combinations of the following five pollutants at the fixed concentration levels: 60 ppb O3, 80 ppb NO2, 40 ppb SO2, 2 ppb Cl2 and 10 ppb H2S. Temperature and relative humidity were varied from a reference condition (210C and 50% RH which is within the current ASHRAE-recommended thermal envelope) to a higher value (28 ° C, 70% RH or 80% RH) to effect the moisture content of the test environment. The test results revealed the dominating effect of Cl2 on copper corrosion and that of H2S on silver corrosion. Increasing the moisture content at 21 ° C caused more severe corrosion for copper when Cl2 was present, but not for silver. When temperature was increased from 21 ° C to 28 ° C at 50% RH, it reduced the corrosion on copper, but not on silver. Voltage biased PCBs had a less effect on corrosion than PCBs without the bias. These results could be used for possible expansion of the ASHRAE-recommended thermal envelope for data centers when Cl2 and H2S are not present, and limit the thermal envelope when Cl2 or H2S are present." @default.
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- W2993607106 date "2020-01-14" @default.
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- W2993607106 title "Effects of moisture content, temperature and pollutant mixture on atmospheric corrosion of copper and silver and implications for the environmental design of data centers (RP-1755)" @default.
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- W2993607106 doi "https://doi.org/10.1080/23744731.2019.1701331" @default.
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