5 Ways to Avoid Galvanic Corrosion

1. 5 Ways to Avoid Galvanic Corrosion

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. Read More : https://sites.google.com/view/vapor-corrosion-inhibitor/blog/5-ways-to-avoid-galvanic-corrosion?authuser=2

10. Select Your Galvanic Corrosion Option Do you want to speak with a professional about your specific situation? Please Contact Cortec Middle East and we will assist you with your requirements.

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