What are the galvanic protection methods for anti-corrosion?

Galvanic protection is a method of corrosion control that involves the use of a more reactive metal to protect a less reactive metal. There are two primary methods: Sacrificial anode protection: This involves attaching a more reactive metal (such as zinc, magnesium, or aluminum) to the structure to be protected. The sacrificial metal corrodes preferentially, shielding the main structure from corrosion. Impressed current cathodic protection (ICCP): This method uses an external power source to apply a direct current to the structure, making it the cathode in an electrochemical cell. This prevents the structure from corroding.

What are the techniques that are used for galvanic protection for anti-corrosion?

Techniques used for galvanic protection include: Sacrificial anodes: Attaching zinc, magnesium, or aluminum anodes to the structure. Impressed current cathodic protection (ICCP): Using an external power source and anodes to protect the structure. Coatings: Applying protective coatings, such as paints or epoxy, can act as a barrier and reduce the likelihood of galvanic corrosion. Insulation: Isolating dissimilar metals can prevent the formation of galvanic cells.

What is the best way of preventing galvanic corrosion?

The best way to prevent galvanic corrosion depends on various factors, including the specific metals involved, the environment, and the desired level of protection. A combination of methods is often used.

Galvanic Protection of Steel Structures with Zinc Anti-Corrosion Coating

Galvanic Protection for Steel: Zinc Anti-Corrosion Coating Safeguard your steel structures from corrosion with zinc anti-corrosion coating.

Galvanic Corrosion

Galvanic corrosion is an undesirable electrochemical process that occurs when two dissimilar metals come into contact in an electrolytic environment (e.g., water or saltwater). The more active metal (anode) corrodes, while the less active metal (cathode) is protected. This phenomenon can lead to accelerated corrosion of the anode.

Key characteristics of galvanic corrosion:

Unintentional process: It happens without deliberate design.
Electrochemical reaction: Dissimilar metals create an electrochemical cell, driving corrosion.
Damage to metal: The anode metal corrodes, weakening the structure.

Galvanic Protection

Galvanic protection is a proactive method used to safeguard metal structures from corrosion. It involves the strategic application of a more reactive metal, often zinc, to act as a sacrificial anode. This sacrificial metal corrodes preferentially, protecting the underlying metal from deterioration.

Key characteristics of galvanic protection:

Sacrificial anode: A more reactive metal (e.g., zinc) is used to protect the base metal.
Electrochemical process: The sacrificial metal corrodes instead of the base metal.
Preventive measure: It is applied before corrosion occurs.

In summary:

Galvanic corrosion is an unintended process that accelerates metal degradation.
Galvanic protection is a deliberate strategy to prevent corrosion. At VIVABLAST we prioritize Zinc as a Sacrificial Anode Method.

Zinc as a Sacrificial Anode

Zinc is a commonly used metal for sacrificial anode protection due to its reactivity and cost-effectiveness. VIVABLAST’s focus on zinc for anti-corrosion is a strategic choice based on its properties and suitability for specific applications.

Key Points

Galvanic corrosion is a natural process that can be detrimental to metal structures.
Galvanic protection is a proactive approach to mitigate this issue.
Zinc is a popular choice for sacrificial anode protection due to its effectiveness and cost.

VIVABLAST specializes in zinc-based protection solutions.

By understanding the fundamentals of galvanic corrosion and protection, we can make informed decisions about material selection, design, and maintenance to ensure the longevity of metal structures. For more information about the Galvanizing process please refer to our article on the difference between Hot and cold Galvanizing process.

The Role Of Zinc Coating?

A zinc coating is a protective layer applied to steel to provide galvanic protection. It acts as a barrier, preventing corrosive elements like moisture and oxygen from reaching the steel surface. Additionally, zinc serves as a sacrificial anode, corroding before the steel, extending the steel structure’s lifespan.

Types of Zinc Coatings

Several methods can be employed to apply zinc coatings to steel:

Hot-dip Galvanizing

This process involves immersing the steel in a molten zinc bath, resulting in a thick, uniform, and durable zinc coating. It offers exceptional corrosion protection and is widely used for various steel structures.

Zinc Thermal Spraying

Involves spraying molten zinc onto the steel surface using a flame or electric arc. This method is suitable for complex shapes and repairs to existing coatings.

Zinc-rich Paints and Primers

These coatings contain a high concentration of zinc particles, providing both barrier and sacrificial protection. They are commonly used for touch-ups and smaller steel components.

Zinc Electroplating

This process involves depositing a thin layer of zinc onto the steel surface through an electrochemical process. It is often used for smaller components and offers good corrosion protection in controlled environments.

Benefits of Zinc Coatings for Galvanic Protection

Zinc coatings offer numerous advantages for protecting steel structures:

Effective Corrosion Protection: Zinc acts as a sacrificial anode, protecting the steel from corrosion.
Durability: Zinc coatings are known for their longevity and resistance to harsh environmental conditions.
Cost-Effective: The long-term protection provided by zinc coatings often outweighs the initial investment.
Versatility: Zinc coatings can be applied to various steel structures and components.
Environmental Benefits: Zinc is a recyclable material, making it an environmentally friendly choice.

Application and Maintenance of Zinc Coatings

The application of zinc coatings requires expertise to ensure optimal performance. Proper surface preparation is crucial for achieving a strong bond between the coating and the steel. Regular inspections are recommended to identify any damage to the coating and perform necessary repairs. While zinc coatings offer excellent protection, maintaining their integrity through inspections and minor touch-ups when needed can extend their lifespan significantly.

VIVABLAST completed a comprehensive Thermal Spray Application (TSA) coating project for a valued client in Vietnam. Our team successfully applied high-quality metal coatings to enhance the durability and performance of the client’s assets. To learn more about our TSA coating services and how we can help protect your equipment, please contact us. .

By understanding the principles of galvanic protection and the different types of zinc coatings, you can make informed decisions to safeguard your steel structures from corrosion.

About Us

VIVABLAST was founded in 1994, as a 100% foreign-owned company with an ambition to become the most preferred and trustful service provider for industrial assets protection in Southeast Asia.

Over the past two decades, Southeast Asia experienced rapid economic growth with significant investments in industrial facilities, equipment, and infrastructures of Oil and Gas, Renewable Energy, Marine, Power Generation & Manufacturing sectors.

Hence, VIVABLAST has succeeded as a reliable subcontractor for many International & Domestic companies by delivering our professional services to such prestigious companies as PIRIOU, JGCS, Technip, KNOC, Metacor, PTSC groups, Vietsovpetro, etc. with great passion.

Our innovative system of mobile blasting & painting workshops can be mobilized anywhere in Southeast Asia for all major projects and infrastructure sites, which has performed very well during Vietnam’s first refinery project – Dung Quat followed by Vung Ang 1.2 Power Plant project and the biggest Oil & Gas complex in Vietnam – Nghi Son Refinery.

In 2014, VIVABLAST landed in the soils of Thailand, Myanmar, and Malaysia to capture the growing demands of customers at any time and anywhere.

Over 28 years of steady deliberate growth, we feel confident and proud of our team and their capacities to play a vital role in the multi-disciplinary industrial services provider.

Why Choose Us?

Expertise of industrial assets preserving since 1994

FAQs

What solutions does VIVABLAST offer?

VIVABLAST is a company that offers surface preparation and industrial painting solutions for various industries such as oil and gas, marine, construction, and mining. Some of the solutions they offer include abrasive blasting, hydro blasting, tank cleaning, industrial coating, and passive fire protection.

Who is the CEO and leadership team?

Board of Management

Mr Jacques Vivarès – Chairman
Mr Boris Vivarès – VIVABLAST Group General Director – Commercial & Business Development
Mr Shanthamani Muthukumar – VIVABLAST Vietnam General Manager

What is our history and background?

VIVABLAST is a global provider of industrial asset protection solutions in Vietnam, Thailand, Myanmar, and surrounding countries. VIVABLAST is a 100% foreign-owned Company accredited ISO 9001:2015 & ISO 45001:2018 by Bureau Veritas with offices and setup over South-East Asia. Since 1994, we have been servicing industry leaders in major projects from construction phase to maintenance programs. Our vertical expertise includes all industry sectors, particularly: oil & gas, power & utilities, shipbuilding, mining and manufacturing. We design and deliver professional services to preserve our Clients’ assets sustainably, through efficient and reliable specialty services and integrated solutions.

What is our approach to sustainability and social responsibility?

VIVABLAST is committed to sustainability and social responsibility. The company aims to reduce its environmental impact through various initiatives, such as implementing environmentally friendly technologies and reducing waste. Additionally, VIVABLAST has programs in place to support its employees, their families, and the communities in which they operate. The company also supports various charitable organizations and encourages its employees to participate in community service activities.