PENGARUH KONSENTRASI INHIBITOR EKSTRAK DAUN KAKAO (Theobroma cacao) TERHADAP LAJU KOROSI BAJA HARDOX 450
DOI:
https://doi.org/10.25077/jfu.3.4.222-228.2014Abstract
ABSTRAK
Telah dilakukan serangkaian uji korosi dan analisis struktur mikro terhadap baja Hardox 450. Penelitian ini dilakukan dengan menggunakan medium korosif H2SO4 3% dan Na2SO4 3%. Metode yang digunakan adalah metode weight loss untuk pengukuran laju korosi dan metode potensiodinamik untuk melihat nilai arus korosi beserta potensial korosi. Baja direndam di dalam medium korosif dengan penambahan dan tanpa penambahan inhibitor. Variasi konsentrasi inhibitor yang digunakan adalah dari 1% hingga 10% dengan lama perendaman lima hari. Hasil penelitian menunjukkan bahwa dari variasi konsentrasi yang diberikan laju korosi terbesar terjadi pada baja tanpa penambahan inhibitor, sedangkan laju korosi berkurang dengan penambahan inhibitor, terlihat dari kurva Tafel yang menunjukkan penurunan Ikorosi. Semakin besar konsentrasi inhibitor yang ditambahkan maka nilai laju korosi akan semakin menurun dan nilai efisiensi inhibisi korosi semakin tinggi. Nilai efisiensi terbesar didapatkan pada penambahan konsentrasi inhibitor 10%, untuk medium korosif H2SO4 mencapai 63,89% dan untuk medium Na2SO4 mencapai 56,61%. Hal ini menunjukkan bahwa inhibitor ekstrak daun kakao efisien dalam mengendalikan laju korosi dalam medium H2SO4 dan Na2SO4. Dari analisis foto optik morfologi permukaan baja Hardox 450 memperlihatkan permukaan baja dengan penambahan ekstrak daun kakao mengalami korosi lebih sedikit.
Kata kunci : laju korosi, inhibitor, efisiensi, weight loss, potensiodinamik
Abstract
The corrosion test and microstructure analysis of Hardox 450 steel have been done. This research was performed using H2SO4 3% and Na2SO4 3% corrosive mediums. The method used were weight loss for measuring the corrosion rate and potentiodynamic method to see the value of corrosion current and corrosion potential. Steel immersed in the corrosive medium with the addition and without addition of inhibitors. Concentration variation of inhibitor used was from 1% to 10% with five days immersion time. The result based from concentration variation was used showed that the corrosion rate occured in the steel without the addition of inhibitors, whereas the corrosion rate decreases with the addition of inhibitors, by the Tafel curves showed a decreases Icor. The greater concentration of the inhibitor is added then the value of corrosion rate will lower and corrosion inhibition efficiency will increase. Greatest efficiency values both for medium corrosive obtained at inhibitor concentration 10%, 63,89% in H2SO4 and 56,61% in Na2SO4. It shows that the cocoa leaf extract inhibitor is efficient in controlling corrotion rate in H2SO4 and Na2SO4 medium corrosive. From the optical photograph analysed on the surface morphology of Hardox 450 steel showed that the addition of cocoa leaves extract suffered less corrosion.
Keywords: corrosion rate, inhibitor, efficiency, weight loss, potentiodynamic
Downloads
Published
Issue
Section
License
Copyright (c) 2024 Anike Malfinora, Sri Handani, Yuli Yetri
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Please find the rights and licenses in JFU (Jurnal Fisika Unand).
1. License
The non-commercial use of the article will be governed by the Creative Commons Attribution license as currently displayed on Creative Commons Attribution-NonCommercial 4.0 International License.
2. Authors Warranties
The author warrants that the article is original, written by stated author(s), has not been published before, contains no unlawful statements, does not infringe the rights of others, is subject to copyright that is vested exclusively in the author and free of any third party rights, and that any necessary written permissions to quote from other sources have been obtained by the author(s).
3. User Rights
JFU's spirit is to disseminate articles published are as free as possible. Under the Creative Commons license, JFU permits users to copy, distribute, display, and perform the work for non-commercial purposes only. Users will also need to attribute authors and JFU on distributing works in the journal.
4. Rights of Authors
Authors retain the following rights:
- Copyright, and other proprietary rights relating to the article, such as patent rights,
- The right to use the substance of the article in future own works, including lectures and books,
- The right to reproduce the article for own purposes, provided the copies are not offered for sale,
- The right to self-archive the article.
5. Co-Authorship
If the article was jointly prepared by other authors, the signatory of this form warrants that he/she has been authorized by all co-authors to sign this agreement on their behalf, and agrees to inform his/her co-authors of the terms of this agreement.
6. Termination
This agreement can be terminated by the author or JFU upon two months notice where the other party has materially breached this agreement and failed to remedy such breach within a month of being given the terminating partys notice requesting such breach to be remedied. No breach or violation of this agreement will cause this agreement or any license granted in it to terminate automatically or affect the definition of JFU.
7. Royalties
This agreement entitles the author to no royalties or other fees. To such extent as legally permissible, the author waives his or her right to collect royalties relative to the article in respect of any use of the article by JFU or its sublicensee.
8. Miscellaneous
JFU will publish the article (or have it published) in the journal if the articles editorial process is successfully completed and JFU or its sublicensee has become obligated to have the article published. JFU may conform the article to a style of punctuation, spelling, capitalization, referencing and usage that it deems appropriate. The author acknowledges that the article may be published so that it will be publicly accessible and such access will be free of charge for the readers.
