Corrosion monitoring can be conducted either periodically or continuously, with the monitoring frequency being influenced by the chosen monitoring technique, the extent of corrosion on the target component, and the associated monitoring expenses. The corrosion monitoring approach dictates the speed at which corrosion rates can be assessed. For instance, while corrosion coupons typically necessitate monitoring intervals exceeding a month, resistance probes can offer more frequent readings, ranging from hours to days.

Corrosion coupon monitoring, as one of the fundamental techniques for corrosion assessment, offers simplicity in operation and high data reliability. It serves as a vital criterion for equipment and pipeline material selection. Shengli Refinery currently employs two primary corrosion coupon monitoring methods.

When the etching rate is low or the etching rate changes frequently with other parameters, we should use sensitive thin components. Thicker components will last longer if the corrosion rate is high. The best compromise between sensitivity and longevity depends on the environment.