Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Cathodic Protection

Optimization Corrosion Protection Parameters of steel pipeline By Using Taguchi Experimental Design

Naser Korde Zedin; Muhammed A.Mahdi; Ruaa Abd Al Kaream Salman

Engineering and Technology Journal, 2016, Volume 34, Issue 4, Pages 754-761

Cathodic Protection System (CPS) is used to reduce corrosion by minimizing the difference in potential between anode and cathode. Two types of Cathodic protection systems are usually applied: The galvanic protection systems use the sacrificial anodes, the other system is impressed current (that used in this paper), and this can be achieved by applying a current to the structure to be protected from electrical source. The main objective of this work is to determine experiments designed according to Taguchi method and Analysis the results by MINITAB program. Experiments have been conducted by using L9 orthogonal array with three parameters (concentrations of NaCl solution, Temperate and Speed of Solution) at three levels (low, medium and high). The result of research based on the signal to noise ratio (S/N) depending on the condition smaller is better approach. The results of this paper show that the significant factor is NaCl wt% and the optimum combination of parameters which were reducing the corrosion are temperature (35 °C), the speed of solution (15 r.p.m) and the NaCl concentration (20 %wt).

Optimum Effect of Factors Influencing on Sacrificial Cathodic Protection for Steel Wall

Mohammad H. Hafiz; Wissam K. Hamdan; Saad E. Kaskah

Engineering and Technology Journal, 2012, Volume 30, Issue 18, Pages 3154-3163

The Box-Behnken Design (BBD) is used to model the sacrificial Cathodic
Protection System (SCPS) to find the factors effectiveness behaviour. For protection
potential assessment the BBD receives (resistivity of environment, sacrificial anode
alloy, distance between anode and cathode and surface area for the structure to be
protected) as input and gives the protection potential as output. By applying BBD
with their analysis tools we get many results. The important results which are the
factors individual effectiveness on the sacrificial cathodic protection (SCP) process
are the resistivity which has the greatest effect on the potential protection (rank=1)
followed by sacrificial anode alloy type (rank=2), surface area for structure protected
required (rank=3) and distance between anode and cathode (rank=4). The interaction
of sacrificial anode alloy and cathode area (χ2χ4) has significant effect on CP process
with the limits which are used in this work while the other factors interaction (χ1χ2,
χ1χ3, χ1χ4,χ2χ3, χ3χ4) has insignificant effect on the limits which used in this work.

Galvanic Cathodic Protection Evaluation of a Steel Pipe in Iraqi Soil

Jafer T. Al-Haidary; Mohammed H. Hafiz; Yasir Muhi Abdu Al-Sahib

Engineering and Technology Journal, 2011, Volume 29, Issue 9, Pages 1673-1690

Corrosion is the main problem for the embedded pipelines in different
environment resistivities. The most effective method to overcome this problem is
cathodic protection which represents as a control method of the pipe corrosion.
For achieving longer life of the external corrosion control system and evaluating
the performance of aluminum alloys which have been used as sacrificed anodes
to protect the embedded carbon steel pipe in different artificial simulated
resistivity of soils in Iraq of [5000 , 1000 , 600 , 50 and 25 (Ω.cm)]. Results show
that (Al-10 wt% Zn) as sacrificial anode alloy has the best anode capacity
compared with other anodes under these conditions (Al-5 wt% Zn), and (Al-15
wt% Zn). The selection for these alloys based on that they have high potential in
many environments when coupling with steels without effect of microbial,
obstacle and stray current. The polarization curves of alloys also show no
passivation behavior in artificial resistivities. The corrosion rate of different anode
alloys was determinated as a function of applied cathodic protection.
It was found a relationship between electric potential and time which
determine the optimum potential in different soil types for the three above selected
electrodes (anodes).