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Titanium Anode For ICCP Systems

Edit: Shaanxi Elade New Material Technology Co.,Ltd    Date: Dec 03, 2015

                                                    ANODE FOR ICCP SYSTEMS
Brief Introduction
ICCP systems as an effective method for corrosion control has been widely approved by people.
Its principle is based on the theory of electrochemical.The material to be protected from corrosion by passing of an external cathode current,reduce the surface potential of the protected material.Thus reducing the corrosion rate of metal.ICCP systems has been widely applied in reinforced concrete, ships, Bridges, tanks, chemical equipment, pipeline etc. Auxiliary anodes is one of the core components of ICCP systems , It is meaningful for correct choice of auxiliary anodes.


Requirements of Ideal auxiliary anode for ICCP


Superior electrical conductivity, Operated at high current density,low polarizability.
When applied in environment,Anode should have good chemistry (static), electrochemical (dynamic) stability, low consumption, long expected life.
Anode should have certain mechanics performance.
It’s easy to process, transport, install and use.
Low cost of maintenance.
Anti-abrasion,Anti-erosion.
No environment pollution during operation.

ICCP anode


Choice of auxiliary anode for ICCP
In order to choose good auxiliary anodes, We must know the problem of thermodynamics and dynamic of anode with electrochemical reactions under the special environment.
1. Thermodynamics
      M—ne         Mn+  -----------------(1)

      2Cl- —2e       Cl2   ------------------(2)

     2H2O —4e      O2 + 4H+    ---------(3)
       The reaction of Soluble anode: (1)
       The reaction of Micro soluble anode: (1)+(2) or three
       The reaction of Insoluble anode(DSA):(2) or(2)+(3)  


Choice of auxiliary anode for ICCP
Dynamics
Current intensity:No matter how to apply the power on the anode,the current density of anode is varying within limits,The current density will influence the overpotential of anode,then affect the anode product.
The concentration changes of conductive ionic at working media,It including reactant and resultant.For example,The reaction of anode is Chlorine evolution,It result of large amount of Chlorine ion in seawater,and the potential of Chlorine evolution is lower than Oxygen evolution,If it is small and close environment of seawater.the anode will be Chlorine evolution firstly then Chlorine and Oxygen evolution together.it result of the chlorine ionic cann’t supply anymore.


Comparison of several electrode


Item

Resistivity(ohm.m)

Current density(A/m2)

Consumption rate(kg/A.a)




Chlorine Evolution

Oxygen Evolution

 

Graphite

3~8×10-5

5~10

0.13~0.22

0.9

 

Magnetic

iron oxide

3.3×10-4

30(OE)


1~2×10-3

Pt Anode

4.8×10-7

600

6×10-6

175~200 ×10-6

HSCI

7.7×10-7

5~80

0.3~1

0.05~2

 

MMO

1×10-7

100(OE)

600CE

 

2~4×

10-6 (OE

2~6×10-6

(CE

 

Conductive Plastic (flexible anode )

0.015

1.268


0.1(Superficial consumption)

 



Comparison of several electrode

It can be seen from the graph,The consumption of Oxygen Evolution for the same electrode is obviously higher than Chlorine Evolution. However the MMO Electrode has low consumption in both Chlorine evolution and Oxygen evolution,And MMO Anode with other advantages such as good conductivity,large flow.Therefore MMO Anode is the good choice of ICCP systems.
MMO Anode Electrochemical Performance

Two types of MMO Coating:
Chlorine evolution type Anode: 
       The major Components of coating:Ru、Ir、Pd、Ti etc. Suitable for use in sea water where Cl2 is the   principal anode product.

The Potential of Chlorine Evolution(SCE)2KA/m2

Polarizability(mv)

 20.2 KA/m2

The potential of Oxygen Evolution (mercurous sulfate)2KA/m2

 

1.10~1.12

18~28   

  0.87~0.9


MMO Anode Electrochemical Performance
Oxygen Evolution type Anode:
The major Components of coating:Ir,Ta oxide. Suitable for use in oxygen evolution environment such as soil, fresh water etc. 

Oxygen Evolution(V, Ref.SCE)       2KA/m2

Polarizability (mv)

20.2 KA/m2

Chlorine Evolution

(V, mercurous sulfate 2KA/m2

 

0.8~0.9

18~50

1.1-1.2

 


 

MMO &  platinized anode technics
MMO Coating
  The mixed metal oxides are formed on the titanium substrate through a process of thermal decomposition, creating an oxide coating of the platinum group metals.
Pt Coating
   The platinum coating is formed through a process of electroplating.

MMO Anode Current density


Electrolyte

 

Maxium Design Current Density (A/m2)

 

Anode Life(Y)

 

Carbonaceous  backfill

 

50

 

20

 

Calcined petroleum coke

 

100

20

Fresh water

 

100

20

Brackish water

 

300

20

Sea water

 

600

20

Reinforce Concrete

 

0.220

 

50


MMO Anode for ICCP
Wire Anode
Titanium. Substrate
meet ASTM standard B348 Grade 1 or Grade 2
Copper cored titanium wire according to  customer’s requests.
Ribbon Anode

Titanium. Substrate
meet ASTM standard B265 Grade 1 or Grade 2


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It's our principal aim to provide the highest quality of materials and integrity of services,so our customer can focus all of their efforts in the more profitable services such as design,engineering, consulting in the world.

Taking advantage of the advanced technology and low labor cost, ELADE is always able to provide high quality products and integrity customer services backed with the most competitive price. Please select us as your honest and reliable partner to save your money and time.

 

Contact Us
Address: No.32, Chuanghui Road, New Industrial Hi-Tech Zone, Xi'an, China
Tel: +86-29-83151667
 Fax:86-29-88880927
 E-mail:helen@sxelade.com
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