Experimental Research of Road Maintenance Salts and Molasses ("Safecote") Corrosive Impact on Metals/Kelių Priežiūrai Naudojamų Druskų Ir Melasos („safecote“) Poveikio Metalų Korozijai Eksperimentiniai Tyrimai/ Экспериментальное Исследование Коррозионного Воздействия На Металлы Солей И Мелассы (“Safecote”), Применяемых Для Содержания Дорог

Abstract

Abstract. The purpose of this investigation is to assess the corrosive impact of de-icing salts and product "Safecote" on metals by performing immersion and spraying experiments. Metallic elements such as metallic bridges, road signs, and cars, situated near the road, are exposed to salts used for road maintenance in winter seasons. The salts, used to de-ice the road surface, can cause metal corrosion. NaCl, CaCl 2 , also mixture of NaCl and CaCl 2 are most commonly used salts in Lithuania. Ions of chloride are the main agents which increase corrosion rate and the metal mass loss. This harmful effect could be mitigated by replacing the salts with organic de-icers, for instance, product "Safecote" based on molasses, which is a by-product of sugar production. The research of mass loss of metals and metal alloys was carried out with the help of two methods -immersion and spraying. In the first case tested metals were dipped into the solutions of NaCl, CaCl 2 , NaCl:CaCl 2 and NaCl:Safecote, in the other -metals were sprayed with solutions of above mentioned metals. Results of the experimental research showed that CaCl 2 has the highest effect on metal corrosion. This solution caused mass loss of galvanized steel 301.71±4.2 mg, and carbon steel -52.27±1.7 mg by immersion method. What is more, aluminium 1.37±0.13 mg, galvanized steel 51.79±0.9 mg, stainless steel 2.11±0.2 mg, and carbon steel 266.58±2.5 mg lost their mass by spraying method. The results of the experiment showed that salts, used for road maintenance in winter seasons, should be mixed with "Safecote", which mitigates corrosion of metals and minimizes their mass loss.

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