This paper presents the study of corrosion in reinforced concrete structures and trends rust. Conditions to corrosive materials, corrosion protection is CP and the condition is not treated with anti- CP , which has been used before for corrosive materials, corrosion protection Type A (Z +) and B (XP +) that kind of a right to be Use rather than. This study concluded that . Opt CP can be used to slow the rusting of real type B (XP +) radius control rust about 25 cm of the type A (Z +) radius control rust about 20 cm conclusion . CP type B (XP +) is more efficient that the type a (Z +). Chloride affect corrosion in reinforced concrete is extremely chloride percentages are much area to a depth of 2.5-5 cm from the surface down to the concrete. Which tend to form in each piece.