The gravimetric method is probably the most widely used method of inhibition assessment.Table 3 shows the calculated values of the inhibition efficiency for nail in 1N H2SO4 in the presence and absence of the VanMeN and VanEtN schiff bases.It is observed there is an increase in inhibition efficiency with increase of the VanMeN and VanEtN concentration The I% of the VanEtN at 2x10-3 M reaches a maximum value of 88,2% inhibition.was studied using the weight loss method.