【Corrosion Technology Edition】Daily Question 20170729: What is galvanic corrosion?
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This post was last edited by B0SS on 2017-7-29 at 17:17. To boost the popularity of the Corrosion Technology section related to mechanical equipment, and to foster communication among users so that they can progress together, the 【Daily Question】 activity has been launched. Reward rules: 3 wealth points for replying, 10 wealth points for a correct answer. This topic is valid for two days; no score will be given if it exceeds two days. Term explanation: What is galvanic corrosion? When different metal materials, or the same metal material in different heat treatment states, or the same metal material with different surface conditions come into contact with each other, a macroscopic corrosion galvanic cell is formed in the corrosive medium due to the potential difference between them; the metal with the lower potential becomes the anode, resulting in an increased corrosion rate. This phenomenon is known as galvanic corrosion. ============================ Event Promotion: Petrochemical Zone – “Creative Ideas for Energy Saving” event (the second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum) 2017 Coal Chemical Industry Event – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html (Source: Haichuan Chemical Industry Forum)
Local corrosion at the contact points between different metals in the same medium occurs due to differences in corrosion potentials; this is known as galvanic corrosion
Galvanic corrosion occurs due to differences in corrosion potentials, resulting in localized corrosion at the contact points between different metals in the same medium. These two metals form a galvanic cell, generating an electromotive force that increases the dissolution rate of the metal with the lower potential (the anode) and decreases the dissolution rate of the metal with the higher potential (the cathode). Therefore, the cathode is protected by the anode. An increase in the anode-to-cathode area ratio and a decrease in the dielectric conductivity both exacerbate anode corrosion.
When two different metals come into direct contact in a solution, their differing electrode potentials create a corrosion cell, resulting in the dissolution and corrosion of the metal with the more negative electrode potential; this type of corrosion is known as galvanic corrosion
Galvanic corrosion: local corrosion that occurs at the contact points between different metals in the same medium due to differences in their corrosion potentials
Coupling corrosion: Local corrosion that occurs at the contact points between different metals in the same medium, due to differences in their corrosion potentials. Also known as contact corrosion or bimetallic corrosion. The basic components of galvanic corrosion include a cathode, an anode, an electrolyte, and a conductor; if any one of these components is removed, galvanic corrosion will cease.
Local corrosion at the contact points between different metals in the same medium occurs due to differences in corrosion potentials
Galvanic corrosion occurs due to differences in corrosion potentials, resulting in localized corrosion at the contact points between different metals in the same medium.
When two different metals come into direct contact in a solution, their differing electrode potentials create a corrosion cell, resulting in the dissolution and corrosion of the metal with the more negative electrode potential. This type of corrosion is known as galvanic corrosion, or contact corrosion, or bimetallic corrosion.
Galvanic corrosion occurs due to differences in corrosion potentials, resulting in localized corrosion at the contact points between different metals in the same medium.
Galvanic corrosion occurs due to differences in corrosion potentials, resulting in localized corrosion at the contact points between different metals in the same medium.