RUST PROTECTION TECHNIQUE
ADOPTION FOR HARBOUR PIPE-LINE
New Zealand engineers are already employing the recently-developed antirust technique known as cathodic protection. The Lyttelton-Diamond Harbour water pipe-line is being fitted with an anti-rust device, and a system for external protection is being fitted to the New Plymouth Harbour Board’s dredge, Paritutu. In spray-laden marine atmosphere, rusting is rapid and destructive. Here and below water, the electrochemical processes of corrosion are speeded. In sea water, brown rust forms where cathodic and anodic points on the sur-
face of iron are short-circuited and cause the iron to dissolve.
The cathodic protection technique stifles the corrosive action of these innumerable tiny electrodes on the metal surface. When a second connected metal, which functions mainly as an anode, is immersed in the water with the iron, it is attacked more readily than when alone. The iron, which is mainly cathodic, is less readily attacked. Magnesium anodes are being fitted to the harbour pipe-line. ,
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Bibliographic details
Press, Volume XC, Issue 27408, 22 July 1954, Page 4
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158RUST PROTECTION TECHNIQUE Press, Volume XC, Issue 27408, 22 July 1954, Page 4
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