Hot Passivation

An intact passive layer protects metal surfaces against corrosion in a reliable way thus preventing material failure. Particularly in systems containing butadien, a passive layer is required, because butadien has a dangerous property: In combination with oxygen or oxygen carriers such as rust, it will transform into the so-called “popcorn polymer“. Once originated, this solid polymer will continue to grow resulting in massive deposits and obstructions within the plant. If you do not react in time, plant sections or pipes might burst and cause massive damages.

In such cases, the hot passivation method offered by KOPSCHINA is the right choice. During hot passivation, rust and deposits will be removed from your plant. The result is a metallic pure surface which is ready for passivation. In order to keep your plant free of oxygen, we use sodium nitrite at a temperature of more than 90°C instead of hydrogen peroxide. The warmth accelerates the passivation. The whole process is permanently and analytically supervised by our staff.

The hot passivation method is the right choice for the commissioning of plants containing butadiene – whether following the quinquennial TÜV inspection or after other stops. The reason is that air will get into the system when the plant is opened; this will promote the formation of rust and the formation of the popcorn polymer.

KOPSCHINA’s hot passivation ensures a continuous and smooth operation of your plants also in refinery furnaces and large combustion plants: The passive layer caused by the hot passivation process prevents premature deposits such as coke. Thus, the high efficiency of your plant will be preserved for a long time!