Evaluation of the inhibitor synergetic effect of aminotris (methylenephosphonic) acid and metallic salts on the corrosion of iron in acidic medium

In the first part of this study,the effect of addition of various cations (cu2+,mn2+,ca2+,zn2+) and the aminotris-(methylenephosphonic) acid (atmp) on the inhibition of iron corrosion in 1m hcl were studied using electrochemical methods (polarisation curves and eis). results indicate a significant synergistic effect between atmp and zn+2+. in the second part,the corrosion behaviour of iron in 1m hcl in the absence and presence of different ratios zn/atmp was studied using weight loss test and electrochemical techniques. the immersion solutions were analyzed using the spectroscopy induction coupled plasma. the results confirm the presence of synergistic effect between atmp and zn2+,which can be was attributed to the formation of zn and atmp complex. the maximum protection efficiency was observed at the ratio zn/atmp: 50%/50%.