?url_ver=Z39.88-2004&rft_id=1617041088&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=PENGARUH+EKSTRAK+DAUN+KAKAO+SEBAGAI+INHIBITOR+DENGAN+VARIASI+KONSENTRASI+0%25%2C+3%25%2C+5%25+DAN+7%25+TERHADAP+LAJU+KOROSI+PADA+BAJA+ST+37+DENGAN+WAKTU+PERENDAMAN+3+HARI+DAN+6+HARI+DALAM+MEDIUM+KOROSIF+NACL+3%25+&rft.creator=+NIA+DIANA%2C+1617041088&rft.subject=530+Fisika&rft.description=Penelitian++ini++bertujuan++untuk++mengetahui++pengaruh++penambahan++dengan+konsentrasi++inhibitor++ekstrak++daun++kakao++0%25%2C++3%25%2C++5%25++dan++7%25++dalam++medium+korosif++NaCl++3%25++terhadap++laju++korosi++pada++baja++St++37%2C++mengetahui++pengaruh+ekstrak+daun+kakao+dalam+menghambat+laju+korosi+pada+baja+St+37+dalam+larutan+NaCl++3%25++terhadap++struktur++mikro++yang++dihasilkan++pada++baja++St37++setelah+direndam.++Metode++pengurangan++berat++dilakukan++untuk++mengetahui++nilai++laju+korosi++yang++dihasilkan.++Hasil++uji++fitokimia++memperlihatkan++bahwa++adanya+kandungan+tanin++yang+terdapat+pada++ekstrak+daun+kakao.++Hasil++fourier+transform+infrared+(FTIR)+memperlihatkan+gugus++gugus+fungsi++yang+terbentuk.+Hasil++x-ray+diffraction+(XRD)+memperlihatkan+bahwa+fasa+yang+terbentuk+merupakan+fasa+Fe+murni.++Hasil++scanning++electron++microscopy++(SEM)++memerlihatkan++adanya+gumpalan+dengan+berbagai+ukuran+dan+lubang+hitam+yang+merupakan+hasil+korosi.+Hal+ini+diperkuat+dengan+adanya+hasil+energy+dispersive+spectroscopy+(EDS)+yang+memperlihatkan++bahwa++semakin++banyaknya++gumpalan++pada++permukaan++baja+menyisakan+unsur+Fe+yang+semakin+sedikit+dan+produk+korosi+FeO+yang+semakin+banyak.++%0D%0A%0D%0A%0D%0AThis+study+aims+to++determine+the+effect+of+adding+inhibitors+of+cacao+leaf+extract+with+concentrations+of+0%25%2C+3%25%2C+5%25+and+7%25+in+3%25+NaCl+corrosive+medium+on+the+corrosion+rate+of+St+37+steel%2C+knowing+the+effect+of+cacao++leaf+extract+in+inhibiting+the+corrosion+rate+of+St+37+steel+in+NaCl+solution+and+knowing+the+microstructure%2C+phase+and+corrosion+products+on+St+37+steel+after+immersion+in+NaCl+solution.+The+weight++loss++method++was++carried++out++to++determine++the++value++of++the++resulting+corrosion+rate.+The+results+of+the+phytochemical+test+showed+that+the+presence+of+tannins++contained++in++the++cocoa++leaf++extract.++The++results++of++the++Fourier++transform+infrared++(FTIR)++show++the++functional++groups++formed.++X-Ray++Diffraction++(XRD)+result++show++that++the++phase++formed++is++pure++Fe++phase.++Scanning++Electron+Microscopy++(SEM)++result++show++the++presence++of++lumps++of++various++sizes++and++black+holes++which++are++the++result++of++corrosion.++This++is++reinforced++by++the++Energy+Dispersive++Spectroscopy++(EDS)++result++which++show++that++the++more++lumps++on++the+steel+surface%2C+the+less+Fe+elements+and+the+more+FeO+corrosion+product.+++&rft.publisher=FAKULTAS+MATEMATIKA+DAN+ILMU+PENGETAHUAN+ALAM&rft.date=2022-04-20&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F63103%2F1%2FABSTRAK%2520%2528ABSTRACT%2529.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F63103%2F2%2FSKRIPSI%2520FULL.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F63103%2F3%2FSKRIPSI%2520TANPA%2520PEMBAHASAN.pdf&rft.identifier=+++NIA+DIANA%2C+1617041088++(2022)+PENGARUH+EKSTRAK+DAUN+KAKAO+SEBAGAI+INHIBITOR+DENGAN+VARIASI+KONSENTRASI+0%25%2C+3%25%2C+5%25+DAN+7%25+TERHADAP+LAJU+KOROSI+PADA+BAJA+ST+37+DENGAN+WAKTU+PERENDAMAN+3+HARI+DAN+6+HARI+DALAM+MEDIUM+KOROSIF+NACL+3%25.++FAKULTAS+MATEMATIKA+DAN+ILMU+PENGETAHUAN+ALAM%2C+UNIVERSITAS+LAMPUNG.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F63103%2F