Definition - What does Corrosion Coupon mean?
A corrosion coupon is a strip made of different types of metals that are pre-weighed and cut to measure for the purpose of estimating the rate of metal corrosion. The coupon is exposed to the corrosive environment and the weight of the sample after 60, 90 or 120 days is compared to its initial weight in order to determine the corrosion rate.
This method is popularly used for studying corrosion and its effects because they are easy to insert and retrieve, and is also an economical method.
Trenchlesspedia explains Corrosion Coupon
Corrosion of metal pipes is a very rampant problem and repair and maintenance costs often escalate exponentially. Using a corrosion coupon is an effective way to monitor corrosion rates in different environments to estimate corrosion and material failure. A corrosion coupon requires installation and monitoring on a coupon rack. The coupon shouldn't be touched by human hands to prevent oil from hands to transfer to the sample. The flow is maintained at a constant rate of 3-5 feet per second to prevent settlement or erosion.
The water flow should be from the unattached end to the attached end to prevent turbulence. The samples are only taken out once the test period of 60-120 days is complete.