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The deposition rate of Cl− and SO42− ions involved in the corrosion under marine aerosol influence was monitored by using different retention methods: alkaline sulfation plate, wet candle and dry plate. It is known that the Cl−/SO42− ratio in sea water and in marine aerosol is near 7. Hence, by using this relationship and the experimental data of deposition rate (both ions collected by the same method), the origin of SO42− ions was unraveled. Inconsistent Cl−/SO4−2 ratios were obtained when deposition rate values for both ions were determined at different collectors in marine locations.

Waste valorisation is a topic in the limelight since environmental concerns are furthering a better use of raw materials. Annually, millions of tons of waste tyres are generated worldwide and represent a great environmental threat that could be used in the development of novel materials for effective protection against steel corrosion. In this work, the performance of 8 new Polymer Modified Asphalts (PMA)-based coatings made up from spent tyres was evaluated on steel samples. Accelerated tests (salt spray, humidity and accelerated aging) as well as adherence and impact studies at laboratory scale were carried out prior to two yearexposure investigation under a very high aggressive marine zone. The analysis of the results revealed the suitability of most of the PMA compositions in terms of anticorrosive protection, adherence and impact resistance. The suitability of these PMA compositions was validated by applying them in automobiles submitted to an aggressive marine environment. ConclusionsIn this work we have demonstrated the suitability of Polymer Modified Asphalts (PMAs) containing spent tyrepowder to protect steel substrates against corrosion under very high aggressive environments. From the results achieved, a suitable adherence and impact resistant was demonstrated. Accelerated and outdoor exposure tests under a marine atmosphere, confirmed the promising protective properties, since no blistering, rusting, cracking and flaking was detected for most of the PMAs compositions evaluated. Additionally, the application of PMAs compositions (2 and 5) in automobiles proved their rust proofing, sealant, waterproofing and impact resistance properties, thus demonstrating the potential of these new coatings.

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