Адсорбция анионов 2-алкилмалоновых кислот на меди и защита ее от коррозии в хлоридных растворах

Адсорбция на окисленной поверхности меди из боратного буфера (pH 7,4), анионов солей алкилмалоновых кислот (АМК), с алкилами, содержащими разное число углеродных атомов, n_C, измеренная эллипсометрическим методом при Е = 0,0 В адекватно описывается полным уравнением изотермы Темкина. Величина стандартной свободной энергии адсорбции (–∆G⁰_a ) для их анионов составляет 47,7 кДж/моль для малоната и достигает 83,9 кДж/моль для нонилмалоната натрия. Это свидетельствует о химической природе адсорбции. Коррозионное поведение меди в водных растворах натриевых солей изучено методами поляризационных и коррозионных испытаний. Добавление 2 ммоль/л солей АМК в боратный буфер, содержащий 10 ммоль/л NaCl, замедляет анодное растворение меди, увеличивая ее потенциал локальной депассивации (Е_пт). Чем длиннее алкил в ингибиторе, тем более выражены его пассивационные эффекты. Семидневные коррозионные испытания меди в 10 ммоль/л растворе NaCl, проведенные в присутствии солей алкилмалоновых кислот, показали, что защитный эффект возрастает с увеличением, как концентрации ингибитора C_ин, так и n_C. В диапазоне C_ин = 0,5–3 ммоль/л степень защиты меди анионами малоновой кислоты увеличивается с 26 до 76%, а нонилмалоновой кислоты с 66 до 95%, доказывает эффективность хемосорбции при защите от коррозии меди нонилмалоната натрия.

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