5 Ways to Avoid Galvanic Corrosion
                     5 Ways to Avoid 
Galvanic Corrosion
When two dissimilar metals come into contact with each other in the 
presence of an electrolyte, galvanic corrosion (also known as 
bimetallic corrosion or dissimilar metal corrosion) occurs. This form 
of corrosion is defined by the rapid corrosion of one metal while the 
other is largely untouched. To put it another way, one metal becomes 
the anode and corrodes preferentially, sacrificing itself to preserve 
the other metal, the cathode.
How to Prevent Galvanic Corrosion?
Galvanic corrosion is usually prevented by removing the fundamental 
ingredients that allow it to form. This usually entails blocking the 
electrical channel in the system's metallic or electrolyte components, 
eliminating oxygen from the electrolyte, and adding corrosion 
inhibitors.
1. Proper insulation
Placing a non-conductive material between the contact points of the 
coupling metals is one of the most effective techniques of breaking 
the electrical channel in the electrochemical cell. Galvanic corrosion 
happens when electrons travel from the anode to the cathode, 
creating a galvanic current in the system. The flow of electrons is 
blocked by the insulation material, which prevents oxidation and 
reduction reactions.
2. Electrolyte Isolation
An electrolyte, which includes ions that assist the oxidation and 
reduction reactions in the galvanic cell, is one of the most important 
ingredients required for galvanic corrosion to occur. As a result, 
methods involving the isolation of the interacting metals and the 
electrolyte may be beneficial in preventing galvanic corrosion. Water-
repellent chemicals operate as barriers between the metal substrate 
and the electrolyte solution to achieve this. Paints, coatings, oils, and 
greases have all been utilised successfully in a variety of sectors.
3. Choosing the Right Contacting Metals
By reducing the potential difference between the metals, galvanic 
corrosion can be avoided. As previously stated, the driving force is 
the potential difference, which causes electrons to flow from the 
anode to the cathode. The higher the potential difference, the higher 
the induced galvanic current and the faster the corrosion.
4. Corrosion Inhibitors
Corrosion inhibitors are chemicals (typically liquids) introduced to the 
electrolyte to stop the chemical reactions that induce galvanic 
corrosion. Inhibitors act in a variety of ways, the majority of which 
involve complicated chemical processes. However, inhibitors that 
remove dissolved oxygen from the electrolyte solution are the most 
effective against galvanic corrosion. The possibility of reduction at the 
anode is reduced when oxygen is removed. The galvanic process is 
paused because cathodic reactions are dependent on anodic 
reactions.
5. Minimizing the Area Ratio
Several studies have found that the ratio of the cathode to anode 
area influences the rate and severity of galvanic corrosion. The 
greater the rate of reduction at the anode, and hence the more 
severe the consequent galvanic corrosion, the larger the cathode area 
in respect to the anode (i.e., the higher the cathode to anode ratio). 
The smaller the cathode to anode area, on the other hand, the less 
severe the degradation.
Read More : 
https://sites.google.com/view/vapor-corrosion-inhibitor/blog/5-ways-to
-avoid-galvanic-corrosion?authuser=2
Select Your Galvanic Corrosion Option
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