Chloride is a major cause of concrete corrosion in the marine environment. The damage caused only damage the reinforcement of the concrete and relatively does not damage the material. Chloride ions attack the passive layer when it reaches the Critical Concentration in that layer, even in high pH conditions.
The damage begins with the formation of holes in the location where the passive layer is destroyed.
Chloride attack on concrete includes a process of corrosion in the form of self catalyst. This process causes rapid refuction of the cross-sectional area of the bone, often invisible because it attacks only on the bone. The mechanism of chloride penetration into concrete that is with the Fe ion reacts with the chloride ion which forms iron chloride (FeCl2). As a result of Chloride attacks in general concrete structures will only have ½ the age of service life and large rehabilitation costs, of course this can only be ensured by a comprehensive assessment