CORROSION ENGINEERING. PLEASE ANSWER A AND B CORRECTLY WITH STEPS. I WILL LEAVE A GOOD RATING IMMEDIATELY IF CORRECT!

Problem 1: Chloride Ingress into Concrete The ingress of chlorine into concrete induces increased corrosion of the steel rebar and limit structure integrity. The diffusion coefficient of chlorine (T=288K) into the concrete follows Fick's law and can be described as following: DCl=(1.2495.051w+8.941w2)1012m2/sforw=water/cementratio=0.43 The threshold chloride concentration in carbon steel is 0.83kg/m3. Chloride concentration higher than 0.83kg/cm3 will destroy the passive film and corrosion will intensify. The chloride diffusion profiles over time can be best fitted with the following Gauss error function: Cx=Cs(1erf2Dnstx) Ct=Cs{1erfc((x/2(DClt)1/2)} for Cs= chlorite surface concentration =5.22kg/m2 x= distance from surface, t= time in seconds a) How long would it take for the chloride concertation to reach threshold levels at the steel rebar if the steel bar is 2cm below the surface? Tablo. Frror Function Valuos from orfe 0 6778_n 9 b) How long would it take to reach the threshold level chloride concentration if the surface chloride concentration increases to 7.186kg/m3