TANK ZINC ANODES

Application
Sacrificial anodes have been used to combat
corrosion of metals in sea water for over 150
years. During this time, the name of Wilson
Walton has become one of the best known in the
marine industry.
Wilson Walton anodes are available in zinc or
aluminium alloys for the protection of ships hulls,
ballast tanks and other structures. If required,
Wilson Walton engineering staff are available to
calculate anode requirements for all types of
structure.
Availability
Wilson Walton have developed a number of aluminium and zinc sacrificial anode alloys for
marine use. Aloline is a range of indium activated aluminium-sinc alloys. Zincoline is the
trademark for zinc alloy anodes conforming to US Mil Specifications. Other alloy formulations or
modifications are available to the standard alloys to suit specific marine conditions.
Zincoline
Zincoline alloys are based on US MIL Spec 12001K and ASTM B418 Type I and are suitable for
general sea water applications but their high specific gravity and low electrochemical capacity
compared to aluminium alloys makes them less favoured for use on jackets and other structures.
Zinc alloys operate over a very wide range of anode current densities and in higher resistivity
waters and saline mud, but are not suitable for use at temperatures above 50o
C. Zincoline is
therefore recommended for use on coated structures where weight is less of a consideration and
for buried sub-sea pipelines at ambient operating temperatures.
For temperatures over 50o
C, special high temperature alloys are available.
Zincalloy can be used in tank applications, particularly in upper areas where installation of
Aloline anodes is restricted.
CTS can also supply anodes manufactured in alloys corresponding to ASTM B418 Type II alloy
which may be more appropriate for use in potable waters.