Corrosion classification coupon

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Specialty Lab Testing Services

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noc18-mm14 Lecture 03-Types and forms of Corrosion

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Standards: Standard must change to avoid equipment corrosion - ISA

Be the first to like this. No Downloads. Views Total views. Actions Shares. Embeds 0 No embeds. No notes for slide. Txt With Graphs 1. Written 1 June Presented as a poster paper at AIC, June The coupons, rated for a day exposure, are known to be less reliable when exposed for a shorter period. However, a set of Purafil corrosion coupons was left out for a nine-month period, showing low levels of corrosion. Subsequent tests with and day exposure periods showed much higher levels expected for the site. This brings into question the ability of the current lab analysis to accurately pro-rate long and possibly short exposures to the standard day analysis level.

Test variability was suggested in field tests comparing a day exposure with a series of concurrent and day exposures under the same conditions.

ISO Classification of Corrosivity of Atmospheres

Repeatability is in question from the results for "sister" coupons exposed together at around 30 days. This test is designed to monitor contamination from inorganic corrosive gas conditions in museums, libraries and archives. The coupons react with sulfur dioxide, oxides of nitrogen, and chlorine. They should not react significantly with volatile organic compounds VOCs.

Environmental Severity Index

In this test, a prepared pure silver coupon is exposed for a specified period of time, then returned to the lab. At the lab, electrolytic stripping determines the amount of corrosion compounds on the coupon.


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Corrosion results are listed for chlorine compounds AgCl , sulfur compounds Ag2S , and all other compounds under the category of "unknowns" Ag-Unk. Corrosion from nitrogen oxides and from silver oxides are included in the unknowns category. Regardless of the exposure period, lab results are corrected to a normalized day exposure.


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The Purafil test is, however, proprietary and is designed to test for lower corrosion levels sought by museums, libraries and archives. One coupon test is often inadequate to characterize an environment. The test also has the vested interest of a company committed to the conservation field. Purafil is interested in the use of the test, freely discussing its applications and problems.

Users who are interested in results as soon as possible many expose the coupons for only 30 days. The average exposure reported by Purafil for museum and archives applications is about 80 days. In the lab analysis the results are always corrected pro-rated to a standard day exposure. Purafil recommends an exposure period of 90 days to reduce the chance of analytical error. They say this should give more accurate results since the amount of corrosion being stripped will be more significant and no correction multiplier is used.

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Some expose the coupons for a period shorter than 30 days with expectedly unstable results. This is due to the low amount of corrosion being stripped and the high correction multiplier to normalize to a day exposure. A set of Purafil corrosion coupons was left out for a nine-month period at the Georgia Department of Archives and History. Despite clear corrosion and discoloration, lab analysis showed only moderate to low levels of corrosion when corrected to a day exposure.

We recommend periodic day tests using our Corrosion Classification Coupons exposed to the air in a critical space. After the test, the coupons are returned for analysis, and we send the customer a report that notes the amounts of corrosion. We include measures of copper and silver loss. We compare levels with the Instrument Society of America Standard Any result that exceeds Class G1 level is considered corrosive and measures need to be taken to remove those gases. Besides the LED indicators, the ECM has an alarm capability for connection to a horn, light, or computer system to alert operators to increasing levels of corrosion.