Zamak is a metal alloy known for its versatility, durability, and strengthen various industrial applications. However, one of these materials' main challenges is corrosion, a natural phenomenon that affects all metals exposed to extreme conditions such as humidity, saltwater, or harsh industrial environments. Despite this challenge, zamak remains one of the best choices for combating corrosion due to its inherent properties, the possibility of applying surface treatments, and its superior performance to other alloys under specific conditions.
Zamak and Corrosion
Although zamak is generally resistant to abrasion, prolonged exposure to corrosive factors such as moisture or salts can accelerate its deterioration. Among the different zamak variants, zamak 3 is more corrosion-resistant than zamak 5, making it the ideal choice for humid or saline environments. However, despite its slightly lower corrosion resistance, zamak 5 has better mechanical properties, making it the preferred option in applications where structural strength is crucial.
Protection Methods Against Zamak Corrosion
Despite the risks, there are multiple solutions to prevent or mitigate corrosion in zamak:
- Metal Coatings: Coatings such as nickel, chrome, or copper provide a protective layer over the alloy, shielding it from corrosive factors.
- Paints and Organic Coatings: Organic coatings act as an additional physical barrier, helping to protect zamak in industrial or marine environments.
- Thermal and Alloy Treatments: Improving the composition of zamak or employing heat treatment techniques strengthens the alloy and enhances its corrosion resistance.
- Cathodic Protection: A more advanced approach that uses electrical currents to prevent corrosion.
Surface Treatments and Secondary Operations for Zamak
Jegan’s surface treatment plant in Eibar is a clear example of how innovation can maximise the durability of zamak. It features a specialised electrolytic bath facility where various processes enhance the resistance and longevity of zamak components. These treatments help protect metal parts from corrosion and optimise their performance in different industrial applications.
Among the available processes, different types of zinc plating are carried out, both on racks and in barrels. Rack zinc plating includes alkaline zinc-nickel coatings in matte black and grey. On the other hand, barrel zinc plating is offered in acidic and alkaline zinc options, both with a bright finish, with and without sealant.
In addition to zinc plating, other treatments are designed to enhance the protection and appearance of components. Chrome plating coats surfaces with a thin layer of metallic chrome, providing excellent corrosion resistance and an aesthetic finish. The painting process applies a coating layer that protects against environmental factors and allows for different finishes according to customer needs.
Another option is the PVD (Physical Vapour Deposition) process, which consists of depositing a thin metallic layer in a vacuum environment, increasing hardness and wear resistance. Similarly, cataphoresis (KTL) is an electrodeposition coating that provides uniform and durable corrosion protection.
Preventive Maintenance for Zamak to Avoid Corrosion
Preventive maintenance is essential for extending the service life of zamak and preventing premature corrosion. The most recommended actions include:
- Regular Cleaning: Removing dirt and residues that can accumulate and retain moisture, facilitating corrosion.
- Periodic Inspections: Detecting early signs of corrosion to apply protective treatments or coatings before damage becomes irreversible.
- Reapplication of Coatings: Ensure that protective coatings remain in good condition to shield zamak.
- Proper Storage: Keeping components in dry, contaminant-free locations to prevent prolonged exposure to corrosion-inducing factors.
Zamak 3 stands out for its excellent corrosion resistance, making it even more suitable for saline and humid environments. However, zamak 5 remains the preferred choice due to its superior mechanical properties. 95% of the zamak consumed in Europe is zamak 5, whereas in the North American market, the opposite is true, with a greater preference for zamak 3. Zamak can overcome corrosion challenges and offer exceptional durability through specialised treatments and proper preventive maintenance.
Jegan: Experience, Technology, and Commitment
Zamak is one of the best options for coping with corrosion in demanding environments. Its natural resistance and technological advancements in coatings and surface treatments make it ideal for industrial applications.
At Jegan, we have over five decades of experience in the die-casting and surface treatment industry. Our treatment plant in Eibar has become a benchmark for innovative anti-corrosion solutions for zamak. We manufacture high-quality components and ensure their durability and strength through our specialised processes.
Combining experience, technology, and a commitment to excellence enables us to offer tailored solutions that enhance our client’s performance, ensuring that zamak components remain the best choice for overcoming corrosion challenges.
