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Manufacturing Technology Insights | Wednesday, January 24, 2024
This article provides an in-depth look at the best corrosion prevention methods for metal parts, helping protect your metal components from further damage.
Fremont, CA: Metal corrosion is a significant issue that can cause damage to surfaces and structures over time. There are various methods to prevent it. General corrosion is one of the common types of metal corrosion, which occurs when most or all of the atoms on a surface are oxidized. This happens because metals tend to lose electrons to oxygen and other molecules in the air or water, which makes them vulnerable to corrosion. When oxygen combines with the metal, it produces an oxide, which can eventually lead to corrosion if not prevented.
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Techniques for Preventing Metal Corrosion
Some ways to prevent metal corrosion include:
Product Design and Material Selection:
After prolonged use or storage, no material or product can be guaranteed to be entirely corrosion-free. Therefore, the materials or products must be electroplated (metal surface treated) to increase their performance and service life. Controlling corrosion is a crucial issue affecting every stage of a product's creation, testing, manufacturing, use, and upkeep. Understanding a product's intended purpose and working environment is just as important for product design as understanding the mechanical qualities of materials.
Electrochemical Protection:
There are two types of electrochemical protection techniques: anodic and cathodic. To halt corrosion, the cathodic protection method uses an electrochemical process to move the protected workpiece's electric charge below the equilibrium reversible potential while in operation.
Anode protection aims to accelerate the corrosion part's potential so that the surface stabilizes and becomes protected. Anode protection can be achieved in two ways: either by adding elements that can be passivated into the protected workpiece or alloy to produce a stable passivation coating on the surface, such as aluminum anodizing or by applying an external current to the protected workpiece, which acts as the anode.
Surface Finishing and Surface Treatment:
The anodic metal coating can resist corrosion independently and be employed as an anode to shield the base metal. Using a coating as a cathode, such as an organic coating with a high concentration of zinc and aluminum powder or a coating of zinc, aluminum, and cadmium on the surface of the steel, can protect the substrate even if it is exposed (due to scratches, for example). Iron is covered in the air medium, while zinc, acting as the anode, corrodes preferentially. On the surface of the corroded zinc, a thick layer of oxide forms to stop the zinc from oxidizing further.
Cathodic metal and non-metal coating: this type of coating uses mechanical shielding to keep metal away from corrosive environments and has strong corrosion resistance and stability.
Add Corrosion Inhibitor:
By applying unique active chemicals to the metal surface to passivate it, corrosion inhibitors are used to slow down and stop corrosion.
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