World Library  
Flag as Inappropriate
Email this Article

Polarization (electrochemistry)

Article Id: WHEBN0025037439
Reproduction Date:

Title: Polarization (electrochemistry)  
Author: World Heritage Encyclopedia
Language: English
Subject: Schaffer collateral, Neuromuscular-blocking drug, Electrogravitics, Polarization, Marcus theory
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Polarization (electrochemistry)

In electrochemistry, polarization is an effect that counteracts and lowers the efficiency of electrochemical processes. The mechanism is typically depletion of reagents causing concentration gradients in boundary layers or the formation of compounds partly passivating the electrode surfaces and having the effect (depending on conditions) of decreasing the output voltage of batteries, increasing the voltage required by electrolysis cells or lowering currents. It is a type of kinetic deviation from equilibrium conditions. It is usually distinguished from overpotential.

Importance in corrosion

As an electrochemical phenomenon it is of importance for corrosion, typically lowering corrosion rates. Increasing polarization of either the cathode or anode - usually by using corrosion inhibitors - helps reducing the corrosion rate.

Types of polarization

  • Activation-reaction at metal-electrolyte
  • Concentration-diffusion in electrolyte

See also

References


This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.