Sustainable porous silica material extracted from volcanic ash of Mount Sinabung Indonesia as corrosion inhibitor di Simatupang, Lisnawaty, Siburian, Rikson, Ginting, Elfrida, Pakpahan, Binsar Maruli Tua, Simatupang, Kristian Adinata Pratama, Siagian, Dea Gracella, Laoli, Edward Relius, Goei, Ronn, Tok, Alfred Iing Yoong

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