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2. Galvanic anode - Wikipedia

   en.wikipedia.org/wiki/Galvanic_anode

   [7] [8] Where this is a concern, zinc anodes may be used. An aluminum-zinc-tin alloy called KA90 is commonly used in marine and water heater applications. [9] Zinc and aluminium are generally used in salt water, where the resistivity is generally lower and magnesium dissolves relatively quickly by reaction with water under hydrogen evolution ...

3. Cathodic protection - Wikipedia

   en.wikipedia.org/wiki/Cathodic_protection

   Aluminum sacrificial anodes (light colored rectangular bars) mounted on a steel jacket structure. Zinc sacrificial anode (rounded object) screwed to the underside of the hull of a small boat. Cathodic protection (CP; / k æ ˈ θ ɒ d ɪ k / ⓘ) is a technique used to control the corrosion of a metal surface by making it the cathode of an ...

4. Sacrificial metal - Wikipedia

   en.wikipedia.org/wiki/Sacrificial_metal

   Many steel objects are coated with a layer of zinc, which is more electronegative than iron, and thus oxidises in preference to the iron, preventing the iron from rusting. [4] Similarly, sacrificial bars of a metal such as aluminium or aluminium alloys can be attached to an oil rig or to the hull of a ship to prevent it from rusting and ...

5. Galvanic series - Wikipedia

   en.wikipedia.org/wiki/Galvanic_series

   The difference can be measured as a difference in voltage potential: the less noble metal is the one with a lower (that is, more negative) electrode potential than the nobler one, and will function as the anode (electron or anion attractor) within the electrolyte device functioning as described above (a galvanic cell).

6. Walmart.com Aims for Amazon with Free Shipping Offer - AOL

   www.aol.com/news/2010-11-11-walmart-com-aims-for...

   Sam Walton's team took a swipe at online retail giant Amazon.com (AMZN) on Thursday with a new offer of free shipping for many online purchases. Instead of requiring a minimum purchase amount to ...

7. Galvanic corrosion - Wikipedia

   en.wikipedia.org/wiki/Galvanic_corrosion

   Galvanizing with zinc protects the steel base metal by sacrificial anodic action. Cathodic protection uses one or more sacrificial anodes made of a metal which is more active than the protected metal. Alloys of metals commonly used for sacrificial anodes include zinc, magnesium, and aluminium. This approach is commonplace in water heaters and ...