Historically highly pigmented metallic zinc primers have been selected for highly corrosive environments such as the offshore and petrochemical industries. These primers gave excellent performance in accelerated corrosion tests and this correlated with what was seen in the field. The primer described in the paper has a long track record in offshore maintenance and repair, and for the first time it has been used in a new construction project for an offshore installation in the Caspian Sea. Until recently conventional anti-corrosive pigments have been unable to meet the performance levels of zinc rich primers in the offshore and petrochemical environments. This paper describes the evaluation of a metallic zinc free anti-corrosive primer which has been formulated to meet the requirements of today's aggressive marine environments, and come close to the performance of certain metallic zinc primers. The conclusion that can be drawn from this investigation is that on average approximately 60% of the expected levels were measured/leached from the doped 'Epoxy Phenolic' coating - this does not necessarily mean that of all results measured 'to date' only 60% is actually recovered. The method exhibits consistency on the levels recovered which can be said to be conclusive evidence that the method determines reproducible levels of leachable chloride content. Even if this 60% error 'correction factor' was applied to the results it would not be a true result as, in essence, this method/technique is quite harsh and it will never represent what occurs in practice - the blending of the co-reacted film generates a significantly higher surface area than would ever be exposed to the stainless steel substrate. Therefore, the chloride extracted using this method could be said to be the 'worst case' scenario.
Zinc metal free primer
Primer ohne metallisches Zink
2008
18 Seiten, 6 Bilder, 2 Tabellen, 6 Quellen
Conference paper
English
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