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sacrificial protection is when reduce the extent of corrosion of a metal in an electrolyte by coupling it to another metal that is electrochemically more active in the environment.
Wiki User
∙ 14y ago
Wiki User
∙ 13y ago1: Magnesium alloy AZ91 was treated in accordance with the invention by the employing four steps as follows: (a) precleaning of the surface, preferably by glass bead honing; (b) anodizing the surface of the alloy; (c) applying a protective primer coat (e.g., a sacrificial double salt coating); and (d) applying the composite coating composition (also a sacrificial coating). If desirable, an overcoat of clear epoxy may be applied to the composite coating.
2: A part made of aluminum Alloy No. 3005 is treated by anodizing in a 15 percent sulfuric acid bath with aluminum as the anode at a current density of about 15 amps/sq.ft. at 15 volts for about 15 minutes. The anodized surface following washing and drying is coated with a primer coat of barium potassium chromate dispersed in a polyurethane resin on a 50:50 weight basis. The polyurethane resin is provided by blending reactive isocyanate prepolymers with hydroxyl-bearing resins. To the 50:50 blend of the double salt and the resin adhesive is added a thinner comprising xylol sufficient to enable the spraying of the mix. After spraying the primer coat on the anodized surface, it is cured by baking at about 150°F for 3 hours. Thereafter, a composite coating composition is applied comprising 4 pounds of said polyurethane resin mixed with 2 pounds of a finely divided alloy of 50% Ba and 50% Mg, sufficient thinner of toluol being added to enable spraying of the mix onto the primer surface. Following spraying, the coating is dried and cured at 200°F for one-half hour. The dried coating contains about 33 percent by weight of the sacrificial alloy.
3: Blocks of a more reactive metal (for example magnesium or zinc) are attached to the ship's hull or the under water pipe.
The magnesium or zinc can also be connected
to a pipeline or oil rig by conducting cables.
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answer it for me please
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