Corrosion protection of the new ship lift Niederfinow: durability of the colour and cathodic protection
For the corrosion protection for the new Niederfinow ship lift, questions concerning the durability of the colour of the coating and the cathodic corrosion protection had to be solved. Colour consistency and accuracy have rarely been considered in quality control of similar structures such as steel bridges. Coloured areas on such buildings often chalk and fade over time and no longer meet the architectural requirements. The blue and yellow colour shades of the coatings acc. to Blatt 94 used at Niederfinow deviated from the required colour stability. When evaluating the deviations, it was important to select the underlying colour system appropriately. In this case, the ΔECMC system was ultimately chosen as the evaluation basis for the yellow colour. Other reasons for colour differences were the processing conditions and a batch change of the coating material. If there are increased requirements for colour stability, e. g. for architecturally significant areas, coatings with particularly colour‐stable pigments should be used. These should be examined in advance by field tests. Cathodic protection was provided by galvanic anodes and an impressed current system. It turned out that, especially with complex systems like this one, mobile measurements during construction should be carried out to compare the target and actual potential.