Category Marine Tech

Cathodic Protection-Corrosion resistance and cathodic protection addresses new challenges

Cathodic protection is essential in protecting metal applications in a range of conditions that can lead to corrosion activity. The metal anode used in the process shields the metal from potential corrosion. This particular protective measure is particularly beneficial in environments where pieces are submerged.

What is cathodic protection?

Cathodic protection consists of using a metal anode to eliminate or control corrosion. Cathodic protection involves the use of a sacrificial metal layer or barrier that is exposed to the corrosive environment. In acting as a barrier, the other metal is protected. The goal is to protect the various applications from rust accumulation. The actual anode is dissolved when the application is submerged to eliminate corrosion from happening.

Common scenarios where they are used

Any steel application that is ever submerged in water are treated using this process. Cathodic protection can be used in pipelines, piles, boat hulls, storage tanks, water heaters and oil well. Coatings like zinc are used to prevent the rust activities. Metallic structures can be protected with cathodic protection. In some cases, the protective method can be used in conjunction with a DC electrical power source for additional activity.

Other applications where cathodic protection is used

• Wind turbines
• Generators
• Pontoons
• Dock gates
• Water tanks

As an alternative to other corrosion control methods

Cathodic protection is considered a good alternative to protective coatings. For buried applications and submersion in waterfront structures, the cathodic protection method is the preferred means of controlling corrosion. This is because compliance and regulatory requirements are more easily met using cathodic protection. There are a number of safety and environmental consequences for application failure. Federal, state and government entities continually increase their requirements for general storage and use of metal applications to prevent disastrous or dangerous conditions from happening. Cathodic protection addresses the need for improved corrosion resistance to meet these new challenges.

Using Capac corrosion systems

Capac corrosion protection systems provide an automatic cathodic protection for boats. The boats can be submerged without experiencing corrosion and rust. An automated controller, a control electrode, surface anode and a meter are used as a part of the system. The protective current is released from the anode and flows into the water to submerged metal parts to reduce and eliminate corrosion. Anode currents are increased automatically in the system whenever the electrode potential drops beneath the preset control value.

Advantages of using such a system

The user-friendly systems put protection in complete control of the operator. Overhead associated with labor are reduced because of the automation features and reduced reliance on manual operation. Easier maintenance resulting from cathodic protection reduces cost of ownerhip. Oscillation and overprotection are other problems managed with the system.

Cathode protection is necessary for a variety of applications. Since required in a range of applications, Capac corrosion protection systems make it easier to adhere to compliance standards. Capac systems provide a reduced maintenance, less labor intensive way to prevent corrosion from causing damage to applications vulnerable to the problem. We invite you to learn more at about cathode protection.

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Marine Growth Prevention Systems and Why Your Ship Should Get One

If you own a private yacht, or a fishing trawler, or any sort of water craft, you ought to be well aware of one of the most prevalent hazards that can befall a seagoing vessel: Biofouling. Biofouling, as its name suggests, is the corrosion and decay that can befall the internal workings of a boat or ship from the unchecked accumulation of such marine organisms as mollusks, sponges, algae and sea slime.


What Is A Marine Growth Prevention System?

The purpose of a Marine Growth Prevention System is to prevent biofouling from overtaking and completely ruining the piping system of your vessel. It is used primarily in seawater cooling systems, but has applications all throughout the workings of a boat or ship. It is also frequently used in such stationary systems as oil platforms and power stations that are located directly on the water.


Marine Growth




Why Is Biofouling Such A Dangerous Issue?

Piping systems that are of critical importance to the well being of a vessel can be overgrown and completely destroyed by the gradual, unchecked encrustation of marine organisms. They can cause a complete power failure, or wreck the internal piping system of a ship.

Biofouling is such a dangerous issue primarily because the corrosion is caused by live organisms, rather than simple rust or decay due to aging. Because the accumulation of these organisms is guaranteed to proceed apace with no limit besides the one that humans set for them, it is particularly important to be aware of the danger they can cause.





How Does A Marine Growth Prevention System Operate?

A Marine Growth Prevention System will normally be made of copper and aluminum anodes. These anodes will be placed as close as possible to the point where seawater intake occurs. These anodes will be connected to a master control panel. This panel will control the amount of current which is passed to each anode.





Switching on the control panel will produce a steady current of ions, which are then carried through the system by incoming seawater. This stream of ions will carry all through the piping of the vessel and slowly but surely result in an environment which is hostile to the sea creatures which are colonizing there.

The end result is that any organisms that enter into the piping will not wish to stay there. The atmosphere of ions within the piping will be so hostile that these organisms will prefer to pass straight through the piping and out the other side.



How To Tell If Your Ship Requires This System?

All motor operated vessels that spend a significant amount of time out on the water, especially in salt water, will need to be equipped with a Marine Growth Prevention System. If you have invested in a pleasure yacht or a fishing boat, you will do well to protect that investment. A Marine Growth Prevention System is an excellent way to keep your vessel in optimum condition. Persons interested in more information can learn more here.



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Sacrificial Anodes for Cathodic Protection

Cathodic Protection is a method expended to regulate the erosion of a metal surface by making it the cathode of an electrochemical cell. Sacrificial anodes are exceedingly active metals that are spent to avoid a less active material surface from disintegrating. Sacrificial anodes are made from a metal compound with a more deleterious electrochemical capacity than the other metal it will be used to guard. The sacrificial anode will be expended instead of the metal it is shielding, which is why it is represented as a “sacrificial” anode.


The matters utilized for sacrificial anodes are either moderately uncontaminated active metal, for example a ZINC Sacrificial Anode or magnesium, or are magnesium or aluminum composites that have been precisely formed for use as sacrificial anodes. In treatments where the anodes are concealed, a distinct back-fill substance encases the anode so as to certify that the anode will yield the anticipated production.


As the sacrificial anode functions by presenting another metal exterior with a more deleterious electronegative and considerably more anodic surface, the flux will stream from the recently presented anode and the sheltered metal becomes cathodic, producing a galvanic cell. The corrosion effects are transported from the metal exterior to the galvanic anode and will be forfeited in support of the sheltered metal construction.

For edifices such as elongated conduits, where inert galvanic cathodic defense is not satisfactory, and outer DC electrical power source is utilized to deliver satisfactory current.

Cathodic defense systems guard an extensive array of metal constructions in numerous settings. Customary uses are:

  • Steel water or fuel conduits
  • Storage tanks, for example domestic water heaters
  • Steel dock piers
  • Ship and boat structures
  • Offshore oil boards
  • Onshore oil well coverings
  • Metal support bars in concrete structures and edifices
  • Galvanized steel, in which a sacrificial covering of zinc on steel parts shields them from corrosion

In certain situations, cathodic defense can avert stress erosion splitting.

Though there are several linear differences on how a cathodic defense system can be connected, there are merely two straightforward approaches to utilizing cathodic defense.

1. Sacrificial anode cathodic fortification (connecting galvanic anodes)
2. Impressed current cathodic defense (connecting repaired anodes)



Sacrificial Anode Types

Sacrificial Anode Types



Useful Advantages of Utilizing Cathodic Defense

  • Decrease in the price of set-up erosion
  • Decrease in structure catastrophes
  • Decrease in product loss due to corrosion
  • Reduction in interruption for emergency upkeep
  • Escalated structure service existence
  • Augmented level of substructure service to clients
  • Improved well-being and refuge to submerged substructure

Once assembly of a new submerged or immersed system is being intended, corrosiveness of the atmosphere must be deliberated as one of the issues in the planning of the structure. If understanding with comparable systems in the locality of the construction location has revealed that the site situations are destructive centered on leakage and malfunction accounts, cathodic defense must be deemed as a way to limit rust on the new structure.

Cathodic defense is one of the limited approaches of erosion regulation that can be successfully used to regulate deterioration of current suppressed immersed metal exteriors.

Recommended Guide: How Electrochlorination Treats Salt Water

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