Quaternary ammonium compounds that exist as a waxy solid at low temperatures typically exhibit excellent persistency when applied in batch corrosion inhibitors (BCI), which are one of the mainstays of corrosion protection for many integrity management strategies worldwide. The performance of these type of corrosion inhibitor is often evaluated in laboratory conditions, prior to field ap plication. The most common laboratory method to characterize BCI involves the filming procedure called the dip and drip method, where the steel specimen is immersed in neat BCI for a few seconds before testing. However, this dip and drip method carries several drawbacks, one of them being the likely oxygen (O2) contamination what is sure to impact the results. In addition, extrapolation of laboratory measurements to field conditions are often performed without rigorous modeling, and application parameters are consequently suboptimal; this results in inefficient or, at worst, ineffective protection being provided to the steel in the corrosive environment. In this research, a BCI testing procedure was developed for bottom of the line corrosion (BLC) that can maintain stable water chemistry and avoid O2 contamination, with the potential to be adapted for top-of-the-line corrosion (TLC) environments. The
pre-filming procedure of BCI and corrosion testing can be done in the same glass cell which eliminates O2 contamination and have capabilities to remove residual inhibitors after the pre-filming process. The linear polarization resistance (LPR) method was utilized to measure in situ corrosion rates. UV-vis spectroscopy was applied to monitor corrosion inhibitor concentrations, which showed repeatable results and demonstrated the accuracy and efficiency of this methodology of batch inhibition applied for BLC and TLC mitigation.