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No, residual chlorine in water will not damage metal tanks at disinfection doses. Gaseous chlorine released from water will condense as hydrochloric acid (at low concentrations) and could over the longer term lead to oxidation. This is unlikely to be a problem but metal tanks partially filled with chlorinated water do need to be checked periodically.
Chlorine residuals will reduce over time and, at the temperatures in Haiti, will not last for much longer than 24 hours so to ensure disinfection will need to be monitored. This is particularly important if the distribution network has been damaged and the integrity of the pipes cannot be assured
Regards James Montgomery