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Role of Quaternary Ammonium Compounds and ATMP on Biocidal Effect and Corrosion Inhibition of Mild Steel and Copper

Polyphosphates and organophosphonates are used as corrosion inhibitors 
in cooling waters. Biocides are also added to avoid microfouling by cooling 
water in industries. This work has been undertaken to find the influence of 
biocides such as quaternary ammonium compounds like cetyltrimethyl 
ammonium bromide (CTAB) and cetyl pyridinium bromide (CPB) on the 
corrosion of mild steel and copper in the presence of phosphonates. Cationic 
biocides are found to be highly efficient and the killing efficiency is found to 
be more for CTAB than CPB. On the other hand, CPB is found to be better 
than CTAB when biocides are used with inhibitor. Between the two metals 
chosen, the inhibition efficiency towards copper was observed to be more 
than mild steel due to the addition of CTAB and CPB with inhibitor. 
Polarization studies revealed that the presence of biocide CTAB with 
inhibitor gives the inhibition efficiency of about 80% for mild steel. CPB 
with inhibitor shows higher interference between biocide and inhibitor, 
whereas CPB alone is found to act as an inhibitor for copper (73%), which 
shows that the inhibitor might interfere in the biocidal action on copper.