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| Home >> Services >> Anodic Protection System Design |
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| In circumstances where cathodic protection is not practical, such as in strongly alkaline or acidic environments, anodic protection is a useful corrosion control technique. Specifically, in metal-environment conditions where active-passive behaviour is demonstrated, anodic protection is usually effective. In practise, the metal-environment potential is held in the passive region by polarizing the structure in the electropositive direction. Historically, anodic protection has the widest application in the process industries and in particular on mild or stainless steel equipment used for concentrated sulfuric acid storage. Equipment, such as pulp mill digesters and recausticizing (white, green & black) liquor clarifiers and storage tanks have also been effectively protected. |
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- Batch and continuous digesters
- Clarifiers and liquor storage tanks (white, green & black)
- Sulfuric acid storage tanks and piping
- Sulfuric acid coolers
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Date : May-01
Author : J.I. Munro / W.W. Shim
Notes : NACE Materials Performance
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| Most metals will corrode within a certain range of electrical solution potential and solution pH. At potentials more negative than this range, corrosion ceases (cathodic protection). At potentials more positive than this range, several metals become passive. For these metals the potential can be shifted electropositively into the passive range through anodic protection (AP). AP is especially applicable to sulfuric acid (H 2 SO 4 ) and caustic liquor environments. It often permits a designer to use a low alloy rather than a corrosion-resistant metal, at an overall cost savings. |
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Date : Nov-98 & Dec-00
Author : J.I. Munro / W.W. Shim
Notes : Sulphur 98 Conf. & NACE Materials Performance |
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| This article discusses the use of anodic protection (AP) in combating iron contamination, general tank wall wastage, and hydrogen grooving in carbon steel sulfuric acid (H 2 SO 4 ) storage tanks. It also addresses the use of AP for stainless steel acid piping and coolers. Topics include experiences using AP in acid storage tanks, theory of AP, design philosophy, engineering materials used, and remote monitoring equipment. |
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