Corrosion passivation of ballast tanks

Your ballast tanks protected from corrosion influences within one day

Save time and maintenance costs

Sandblasting and rust chipping is a time-consuming job and involves a lot of residual waste. nC Corrosion Passivator Fluid can be poured directly into your ballast tanks and achieve full coverage of the walls by floating. nC Corrosion Passivator forms a chemical bond with the metal, keeping ballast tanks protected from corrosion for 5 to 15 years, depending on environmental conditions.

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Easy application with 100% coverage

nC Corrosion Passivator Fluid can be applied by floating in addition to brushing, rolling or spraying. Floating is an effective and fast process for achieving full coverage, even in practically inaccessible areas. A trained team of two can passivate up to 8 ballast tanks in one day. Read on to learn more about the application process.

Step 1: Get started well prepared

Provide the right supplies. Consider safety clothing, pneumatic keys for opening manholes, adequate lighting, a properly functioning pumping system or submersible pumps and any spraying equipment.
Download the application sheet
for a complete list of supplies needed for Corrosion Passivation.

Step 2: Prepare ballast tanks

Any loose rust, paint and mud should be removed from the tank. Blasting and chipping is not necessary. The tank does not have to be dry. Work with nC Corrosion Passivator Fluid can be performed on both dry and wet surfaces.

Step 3: Application of the nC Corrosion Passivator Fluid

nC Corrosion Passivator Fluid can be applied by brush, spray or float. To ensure complete coverage, it is advisable to spray the highest surfaces of the tank top. Even heavily corroded areas should be sprayed or rolled in advance. When working with spraying equipment, proper ventilation is important.

Step 4: Distribute the Corrosion Passivator over the tank

For the float process, it is important to properly distribute the nC Corrosion Passivator Fluid between the rafters at the bottom of the tank. The Fluid is low in consumption with a ratio of 1L per m3. If dividing is not possible, pump the water with the Fluid to just above the rafters and then wait 10 minutes. This allows the passivator to spread over the entire surface.

Step 5: Pumping the tank full

The nC Corrosion Passivator Fluid floats on the water. By pumping the tank full, the fluid settles against the metal. Both fresh and salt water can be used for the floatation process. Make sure that the end of the hose is placed as deep as possible in the tank during filling. In this way, a good current is created that further distributes the nC Corrosion Passivator Fluid across the water surface. Keep in mind that the filling rate should not exceed 20 centimeters per minute.

Step 6: Emptying ballast tanks

When draining the tanks, again keep the speed of 20 centimeters per minute. The nC Corrosion Passivator fluid thus remains on the surface and is not pumped out of the tank with it, if at all. nC Corrosion Passivator Fluid is not harmful to humans or the environment. When the water is pumped into the surface water, the water/Fluid combination remains well within the legal limits.

Step 7: Checking the tank

If the corrosion passivator fluid is applied correctly, the entire tank is greasy. The grease serves as a carrier to bring the corrosion passivating particles to the steel. The fat disappears by withdrawal and evaporation. After treatment, a color change occurs, from rust color to dark purple. This makes inspecting the tanks easy. The ballast tanks are long-term protection against corrosion influences such as heat, moisture, salt and oxygen.

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