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SCIENCE OUTLOOK Evaluation of long-term corrosion protection performance of zinc laminar coating by Hadi Beirami, Ph.D. of Corrosion Engineering, NACE-CP4 Cathodic Protection Certified Specialist, Trento, Italy [email protected] Massimo Sem, Managing Director, Metalnastri srl, Milan, Italy The aim of this study is to investigate durability and corrosion resistance of zinc laminar coating (zinc-tape) applied in 1991. The coating had been applied on the main water distribution pipes with different diameters, and the atmosphere of the installation area can be classified into the suburban group....

SCIENCE OUTLOOK rate of zinc. Temperature, humidity, precipitation, the amount The oldest and most popular way of preventing corrosion can of sulphur dioxide (pollution) in the air, and the chloride ion be barrier protection. It works by separating the metal from the presence are some parameters that specifically influence how zinc corrosive environment. One type of barrier protection system corrodes. None of these factors can be considered the primary is painting. Furthermore, Cathodic Protection (CP) is another cause of zinc coating corrosion, but they all aect the level of crucial technique...

SCIENCE OUTLOOK The coating had been applied to prevent atmospheric corrosion Conducting a thickness measurement test using the obtained on the outside surface of water pipelines with dierent diameters images showed that an average of 70±30µm of coating remained installed in suburban atmosphere of the Lazio region (Italy) in on the surface (approximately 36% thickness reduction). 1991. As shown in Figure 3a, the samples of this study were Considering that 32 years have passed since the coating was collected from a part of the surface of the pipe that passes over applied, this means that on average,...

SCIENCE OUTLOOK Figure 5 shows EDS spectrum resulting from corrosion products on the prepared sample. In all three obtained spectra, the The durability of zinc tape coating after 32 years of exposure in presence of zinc, oxygen, carbon, silicon and aluminium elements a suburban environment has been examined in this article. The with dierent peak intensities could be seen. A very low amount amount of zinc consumed throughout that span was discovered of iron indicates that the corrosion process on the outer surface to be slightly more than one micron per year. Electron microscope of the pipe has...