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Manufacturing Technology Insights | Tuesday, December 06, 2022
The prevention of metal corrosion is one of the best ways to reduce the loss caused by corrosion.
FREMONT, CA: There is an increased risk of corrosion for metals under 60 percent relative humidity, but many structural alloys require moisture exposure in the air to rust. It is important to consider temperature, absolute humidity, and exposure time when preventing corrosion. Cold metal can also corrode when it meets warmer air with high relative humidity since condensation can lay directly on the metal surface, speeding up corrosion.
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It is almost inevitable that moisture-related corrosion will occur in supply chains at some point - and the cost of corrosion will be enormous. The cost of corrosion-prevention solutions is not only an issue but also the time, effort, and environmental impact of reworking or scrapping components when these solutions don't exist or do not perform as expected.
Supply chains must be smooth, cost-effective, and sustainable by reducing and removing extra costs, time, and environmental burdens.
Product design and material selection: Long-term storage or use of any material or product will result in corrosion. It is possible to increase the performance and life of materials and products through electroplating. Managing corrosion is integral to all steps involved in product design, production, use, and maintenance. A product's design must take into consideration not only the mechanical properties of materials but also how the products will be used and the working environment they will be in when designing products.
Electrochemical protection: Cathodic and anodic protection methods are two types of electrochemical protection. A cathodic protection method suppresses corrosion by lowering the electric charge of a protected workpiece below its equilibrium reversible potential under work conditions. One possible way to implement it is to use the protected workpiece as the cathode and apply an external current; The other is to use the workpiece as the cathode and connect the metal with a negative potential to the workpiece to become the anode of the main battery. During the corrosion process, the anode metal dissolves, and corrosion protects the workpiece.
Surface finishing and surface treatment: Anodic metal coatings can also be anodes to protect base metals and their corrosion resistance. It is still possible to protect the substrate (such as scratches) by coating it as a cathode, for example, with zinc, aluminum, and cadmium coatings on steel surfaces and organic coatings with zinc and aluminum powder. The zinc anode corrodes preferentially in an atmospheric environment, whereas iron remains protected from corrosion. In this case, a dense oxide film forms on the surface of corroded zinc to prevent it from oxidizing continuously.
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