![]() ![]() Zinc primer Topcoat Superior adhesion prevents coating undercut Moisture allows Zinc to ionize and cathodically protecting the steel Damage in coating to steel surface The zinc primer reacts to protect the steel substrate when the topcoat is damaged Steel Zn 2+ Mid coatĩ Technologies Shopprimers Zinc epoxy primers Zinc silicate primers ![]() Zinc containing primers are still the best foundation for a long lasting advanced paint system Cathodic protection Self repairing Reducing risk of undercutting corrosionĨ The ability of providing cathodic protection These are called “Base metals” “Noble metals” have a very strong resistance against corrosion and do not react to form ions unless exposed to very aggressive chemicalsĦ Corrosion / degradation - brings the material "back" to the stable situationĬorrosiveness in an environment increases or varies with: Temperature Salinity Oxygen content Water velocity Acidity Type of electrolyte Content of contaminants / pollution that promotes corrosion Micro-organisms Oxidation of metals is a natural processħ Still the best …. The resistance against oxidation (corrosion) varies for different materials When brought in contact with an electrolyte (aqueous solution that conducts electricity) some metals easily dissolve into ions. Manufacturing Energy Water /Humidity Oxygen Raw material Iron ore Rust The presence of Water / Humidity and Oxygen is a prerequisite for corrosion of steelĥ Manufacturing / refining - brings the material to a higher energy level ![]() ![]() Reaction between the material and the surrounding environment takes place Plates, pipes, profiles, etc. Surrounding environment …….under formation of corrosion products Zinc epoxy versus Zinc silicate Zinc confusions Zinc content in Jotun zinc primers Barrier and Resist projectsģ Corrosion Corrosion is a reaction between Material and 2 Agenda Corrosion Corrosion protection with Zinc Technology ![]()
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