Исследование защитных и адсорбционных свойств солей дикарбоновых кислот на цинке

Изучено адсорбционное, защитное и пассивирующее действие натриевых солей дикарбоновых кислот (сукцината, итаконата, адипината и азелаината) и их композиций с 2-меркаптобензотиазолом (2-МБТ) в нейтральных хлоридных растворах. При адсорбционном исследовании итаконата, сукцината натрия и азелаината натрия на окисленной поверхности цинка при потенциале Е = 0,2 В получены изотермы адсорбции с величинами свободной энергии адсорбции (-DGa0) = 74,3; 59,4 и 73,5 кДж/моль, соответственно. Поляризационные исследования цинка в присутствии 0,5 ммоль/л сукцината натрия приводят к самопроизвольной пассивации цинка, но с увеличением его концентрации растет и плотность тока анодного растворения. Итаконат, адипинат и азелаинат натрия не способны пассивировать цинк во всей исследованной области концентраций. Коррозионные испытания цинка в 0,01 М NaCl водном растворе в течение 7 суток показали, что лучшей защитной способностью обладает смесь адипината натрия с 2-МБТ (9:1): при Син = 5 ммоль/л наблюдается полная защита цинка в течение 7 суток. Композиция сукцината натрия с 2-МБТ (4:1), итаконата натрия с 2- МБТ (4:1) и азелаината натрия с 2-МБТ (9:1) при Син = 10 ммоль/л полностью защищают цинк от разрушения в 0,01 М водном хлоридном растворе.

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