![]() For example, low-cost household batteries typically contain carbon-zinc cells. In some cases, this type of reaction is intentionally encouraged. If the electrolyte contains only metal ions that are not easily reduced (such as Na +, Ca 2+, K +, Mg 2+, or Zn 2+), the cathode reaction is the reduction of dissolved H + to H 2 or O 2 to OH −. The electrolyte provides a means for ion migration whereby ions move to prevent charge build-up that would otherwise stop the reaction. The presence of an electrolyte and an electrical conducting path between the metals is essential for galvanic corrosion to occur. This leads to the metal at the anode corroding more quickly than it otherwise would and corrosion at the cathode being inhibited. The electropotential difference between the reactions at the two electrodes is the driving force for an accelerated attack on the anode metal, which dissolves into the electrolyte. 2.3 US Navy littoral combat ship IndependenceÄissimilar metals and alloys have different electrode potentials, and when two or more come into contact in an electrolyte, one metal (that's more reactive) acts as anode and the other (that's less reactive) as cathode. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |