Causes and Prevention of Galvanic Corrosion of Hex Bolts

Causes and Prevention of Galvanic Corrosion of Hex Bolts

Causes and Prevention of Galvanic Corrosion of Hex Bolts: Galvanic corrosion, also known as contact corrosion or bimetallic corrosion, is an electrochemical process in which one metal reacts with another metal. This process occurs when either two metals or alloys are brought into electrical contact and also occurs in the presence of an electrolyte.

Galvanic corrosion occurs when two or more different types of metals or alloys with different electrode potentials interact with each other. The less pure material forms the anode, while the pure material forms the cathode. A change in electrode potential triggers an attack on the anode, which then diffuses into the electrolyte and coats the cathode, which in this case is metal.

Electrolytes target the migration of ions from the anode to the cathode, causing immediate corrosion of the anode while preventing corrosion effects on the cathode side. The availability of an electrolyte ensures that ions can migrate to allow galvanic corrosion to occur. However, you can effectively prevent it.

How to prevent galvanic corrosion in hex bolts and other fasteners?

Electroplating techniques can be used, in which pure metals such as gold, nickel or silver are used to form the anode. Stainless steel fasteners can be protected by coating with zinc, which is used as an anode.

Choose pairs of metals that have the same electrode potential or at least are close to each other. Because such a pair is less likely to form galvanic corrosion. Using such a pair of metals for all types of construction is the easiest way to balance the electrical potential.

The best way to avoid contact between two metals or alloys is through electrical insulation of the metals. A variety of electrode materials can be used in this process, such as non-conductive materials such as plastic, glass or rubber. For piping with aluminum rods, rolls of plastic pipe can be used to coat the interior.

Galvanic corrosion cannot occur in the absence of an electrolyte. You can use greasing or oil-painting of metals to eliminate the possibility of contact Hex Bolt Manufacturers in India. If it is not possible to coat both metals, coat whichever is good so that if corrosion occurs; The maximum corrosion effect will be the small anode area.

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