Pengendalian Korosi Menggunakan Inhibitor Kitosan Larut Air untuk Baja Lunak dalam Media HCl 1M

Clarissa Welny Saleh, Harmami Harmami, Ita Ulfin
Submission Date: 2017-01-26 09:03:31
Accepted Date: 2017-03-17 10:28:10

Abstract


Kitosan larut air (water soluble chitosan, WSC) berhasil disintesis dari limbah cangkang udang dan dimanfaatkan sebagai inhibitor korosi. Limbah cangkang udang didemineralisasi dan dideproteinisasi untuk memperoleh kitin. WSC diperoleh dari proses deasetilasi kitin dan pemotongan rantai kitosan kasar dengan H2O2. WSC dikarakterisasi dengan FT-IR dan ditentukan derajat deasetilasinya dengan titrasi asam basa. Kinerja WSC dalam menghambat korosi baja lunak HCl 1M telah dipelajari dengan metode polarisasi potensiodinamik. Studi efisiensi inhibisi WSC dilakukan pada variasi konsentrasi 25-175ppm dalam media korosif pada kondisi stagnan dan dengan pengadukan. Hasil yang diperoleh menunjukkan efisiensi inhibisi WSC meningkat terhadap konsentrasi dan mencapai maksimum pada konsentrasi 100 ppm. Efisiensi maksimum WSC diperoleh sebesar 73,50%. Intepretasi hasil pengukuran dengan polarisasi potensiodinamik menunjukkan bahwa WSC merupakan inhibitor tipe campuran.  Adsorpsi WSC pada permukaan baja lunak dalam HCl 1M mengikuti model isotermal adsorpsi Freundlich.


Keywords


inhibitor; kitosan; korosi; polarisasi potensiodinamik

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