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Effect of Water Soluble Salts Affecting Long-Term Durability of Epoxy Coating on Carbon Steels

The effect of soluble salts on long-term durability of carbon steels coated with epoxy paint.  A surface was contaminated by different soluble salt concentrations. Based on NORSOK M-501 and ISO 20340, immersion and cathodic disbonding test were done for 6 months.

Product Number: 51317--9284-SG
ISBN: 9284 2017 CP
Author: Chuljung Kim
Publication Date: 2017
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Offshore platforms are operated more than 30 years without re-docking in very corrosive environment. Therefore higher level of quality is required for reduction of maintenance cost and long term service life time.In maintenance point of view coating and surface preparation are very important factors. Especially water soluble salts concentration on steel surface can significantly affect adhesion strength at the interface of steel and coating.To study the effect of water soluble salts affecting long-term durability performance of carbon steels coated with epoxy paint the carbon steel surface was contaminated by different soluble salt concentration. Based on NORSOK M-501 and ISO 20340 test method sea water immersion test was carried out for 6 months and visual observation and pull off adhesion tests were conducted. In addition the phenomenon that the solute is accumulated on the contaminated boundary layer (Coffee Ring Effect) was studied.The results show that 50?/? and less of salt contamination levels provided acceptable coating performance. Additionally it was confirmed that thicker coating showed better adhesion property.

Key words: Offshore Platform, Water Soluble Salts, NORSOK M-501, ISO 20340, Sea water immersion, Coffee Ring Effect

 

 

 

 

Offshore platforms are operated more than 30 years without re-docking in very corrosive environment. Therefore higher level of quality is required for reduction of maintenance cost and long term service life time.In maintenance point of view coating and surface preparation are very important factors. Especially water soluble salts concentration on steel surface can significantly affect adhesion strength at the interface of steel and coating.To study the effect of water soluble salts affecting long-term durability performance of carbon steels coated with epoxy paint the carbon steel surface was contaminated by different soluble salt concentration. Based on NORSOK M-501 and ISO 20340 test method sea water immersion test was carried out for 6 months and visual observation and pull off adhesion tests were conducted. In addition the phenomenon that the solute is accumulated on the contaminated boundary layer (Coffee Ring Effect) was studied.The results show that 50?/? and less of salt contamination levels provided acceptable coating performance. Additionally it was confirmed that thicker coating showed better adhesion property.

Key words: Offshore Platform, Water Soluble Salts, NORSOK M-501, ISO 20340, Sea water immersion, Coffee Ring Effect

 

 

 

 

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