PENGARUH KOMPOSISI PANI/SIO2 SEBAGAI BAHAN PELAPIS ANTI KOROSI  PADA BAJA TIPE SS 304

dhiny_erlindasari; Diah Hari Kusumawati; Evi Suaebah

doi:10.26740/ifi.v14n3.p316-325

Authors

dhiny_erlindasari Universitas Negeri Surabaya
Diah Hari Kusumawati Universitas Negeri Surabaya
Evi Suaebah Universitas Negeri Surabaya

DOI:

https://doi.org/10.26740/ifi.v14n3.p316-325

Keywords:

corrosion rate, corrosion, PANi/SiO2, baja SS 304, korosi, laju korosi

Abstract

Abstrak

PANi merupakan polimer konduktif yang mudah disintesis, memiliki konduktivitas tinggi, dan mampu menghambat pergerakan ion-ion elektrolit yang bersifat merusak. SiO₂ merupakan bahan keramik anorganik dengan stabilitas termal tinggi dan isolator listrik yang baik. Paduan kedua material ini, membentuk PANi/SiO₂ yang terbukti efektif dalam meningkatkan ketahanan korosi, terutama pada permukaan logam PANi disintesis melalui reaksi polimerisasi oksidasi, sedangkan pembuatan PANi/SiO₂ menggunakan metode pencampuran basah (wet mixing). PANi/SiO₂ dilapiskan pada substrat baja SS 304 menggunakan metode dip coating. Pelapisan dilakukan dengan variasi konsentrasi PANi/SiO₂ yang telah ditentukan sebelumnya, dengan tujuan agar mendapatkan komposisi optimal dan ketahanan korosi yang maksimal. PANi/SiO₂ dikarakterisasi menggunakan FTIR, XRD, dan SEM. Laju korosi diperoleh dengan uji korosi menggunakan potensiostat. Hasil uji korosi menunjukkan bahwa konsentrasi 5,5% memberikan penurunan laju korosi terbaik dibandingkan variasi konsentrasi lainnya, yaitu sebesar 0,63 x 10^-3 mm/year. Konsentrasi ini mampu membentuk lapisan pelindung yang optimal dengan distribusi partikel SiO₂ yang merata serta jaringan konduktif PANi yang efektif menghambat penetrasi ion-ion agresif.

Abstract

PANi is a conductive polymer that is easy to synthesize, possesses high electrical conductivity, and is capable of inhibiting the movement of destructive electrolyte ions. SiO₂ is an inorganic ceramic material with high thermal stability and excellent electrical insulation properties. The combination of these two materials forms a PANi/SiO₂ composite, which has been proven effective in enhancing corrosion resistance, particularly on metal surfaces. PANi is synthesized through oxidative polymerization, while the PANi/SiO₂ composite is prepared using the wet mixing method. The composite is applied to SS 304 stainless steel substrates using the dip coating technique. The coating process was carried out with various predetermined concentrations of PANi/SiO₂, aiming to obtain the optimal composition and maximum corrosion resistance. The PANi/SiO₂ composite was characterized using FTIR, XRD, and SEM. Corrosion rate was measured through electrochemical corrosion testing using a potentiostat. The results showed that the 5,5% concentration yielded the best reduction in corrosion rate compared to other variations, with a value of 0,63 x 10^-3 mm/year. This concentration successfully formed an optimal protective layer, characterized by a uniform distribution of SiO₂ particles and a conductive PANi network that effectively inhibits the penetration of aggressive ions.

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