Corrosion Coupons & Weight Loss Analysis - Alabama Specialty Products, Inc.

Irrespective of the degree of care exercised in the surface preparation of coupons, many uncontrol-lable factors (e.g. microstructural defects) can reduce the accuracy of … See more

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FAQs about Corrosion Coupons & Weight Loss Analysis - Alabama Specialty Products, Inc. Coupon?

How do you calculate corrosion rate?

By dividing both sides of the equation by the coupon surface area, this gives the corrosion rate as equal to a constant multiplied by the current density (amp) / area (cm2). In other words, the rate of weight loss from a given area is directly proportional to the current density. ...

How is corrosion rate calculated using corrosion coupons?

The corrosion rate calculated using corrosion coupons assumes uniform corrosion across the coupon (e.g. uniform corrosion of the pipe wall at the monitoring point). This approximation is acceptable for most circumstances to determine the average rate of corrosion. ...

How do you convert a blank coupon to a corrosion rate?

Any weight loss suffered by the blank coupon should be converted to a corrosion rate expressed in mpy and be subtracted from the corrosion rate of an exposed coupon to give a corrected corrosion rate in mpy for the exposed coupon. 1. Ultrasonic Cleaning: Degrease coupons in benzene, toluene or carbon tetrachloride. ...

How should a corrosion coupon be weighed?

4. The corrosion coupon should be weighed to “4 decimal places” or to the nearest 0.1 milligram. Accurate and precise weights are critical to generating accurate corrosion rate data. Incorrect pre- or post-exposure weights will result in incorrect corrosion rates. ...

Does a coupon reflect the maximum corrosion rate?

Time average: The ability of the coupon to reflect the maximum corrosion rate of a particular event depends on the intensity and duration of that event. Therefore, it may not adequately reflect the peak corrosion rate, and short events may not show a significant increase in weight loss. ...

How should corrosion coupons be installed?

The installation of corrosion coupons is critical for ensuring accurate monitoring and measurement of the corrosion rates within a system. The location of the coupon should be carefully selected based on several factors, including: Accessibility: The coupon should be placed in a location that is easily accessible for monitoring and removal. ...