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Corrosion coupons based on the ISA-71.04 standard are widely used to monitor and evaluate air quality in environments where electronic equipment is sensitive to corrosion. These coupons provide a direct, quantitative measure of the corrosive potential of an environment by reacting with airborne contaminants to form a corrosion film. The analysis of this film helps classify the environment into categories such as G1, G2, G3, or GX, as defined by the ISA-71.04-2013 standard.

Typical applications include:

Corrosion coupons should be placed in locations where environmental conditions need to be evaluated for their corrosive effects on electronic equipment or sensitive components. Here are common placement areas:

• Inside critical equipment enclosures: To check if the environment within enclosures is affecting the performance or longevity of electronics

• Near air intake points: These locations help determine the quality of the air entering sensitive areas and the effectiveness of filtration systems

• Strategic points in data centers: Such as server racks or areas with high airflow to identify potential risks to infrastructure.

• Industrial settings: Near machinery, control rooms, or process areas where airborne contaminants are likely present.

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The coupons should be positioned to accurately reflect the air quality, avoiding direct contamination (like oil or grease). They're often left for a specific time (e.g., 30 days) before being analyzed for corrosion film thickness and composition