J. Yamuna, Dr. Noreen Antony
Abstract
The purpose of the present investigation is to (i) examine the influence the biocide on the inhibition efficiencies of polymer systems such as CMC and PVA with Zn2+ in chloride ion solution (ii) assess the biocidal efficiency of SDS in chloride ion solution in the presence and absence of the inhibitor systems. The corrosion rates of carbon steel in the presence and absence of the inhibitor systems such as CMC and PVA with Zn2+ and also in the presence and absence of the biocide– sodium dodecyl sulphate in aqueous chloride solution were determined. The biocidal efficiencies of the biocides in the presence and absence of the inhibitor formulations are also studied. The inhibitor formulation PVA–Zn2+ in the absence of SDS does not control the bacterial growth at all. Nevertheless, the addition of SDS completely kills the microbes and 100% biocidal efficiency is achieved. Even though SDS has biocidal effect with PVA + Zn2+ system, as the IE is drastically reduced on the addition of SDS, it is not suitable biocide for PVA + Zn2+ system. But the inhibitor formulation CMC–Zn2+ gives 42% biocidal efficiency in the absence of SDS. But the addition of SDS to this inhibitor formulation completely eradicates the microbes. Interestingly, the same formulation with SDS offers a maximum inhibition efficiency of 98%. Therefore CMC–SDS–Zn2+ system is ideal for cooling water system for the control corrosion as well as microbial growth.