Asana, I Wayan Padma Yogi (2023) Deposition Of Stearic Acid Combined Zinc Oxide Superhydrophobic Coating On Carbon Steel Using Chemical Bath Deposition With Design Of Experiment Taguchi Method. Masters thesis, Institut Teknologi Sepuluh Nopember.
![[thumbnail of 6007211022 - Master_Thesis.pdf]](http://repository.its.ac.id/style/images/fileicons/text.png) |
Text
6007211022 - Master_Thesis.pdf - Accepted Version Restricted to Repository staff only until 1 October 2025. Download (2MB) | Request a copy |
Abstract
Studi dilakukan untuk menentukan parameter optimal untuk memperoleh pelapisan superhidrofobik sementara pada baja karbon SS400 dengan melakukan pelapisan menggunakan asam stearat yang dikombinasikan dengan seng oksida untuk memperoleh tambahan kekasaran permukaan. Lapisan tersebut berfungsi untuk melindungi baja karbon SS400 selama waktu penyimpanan dan waktu penanganan dalam industri manufaktur. Proses modifikasi sifat permukaan dilakuakan melalui pengetsaan kimia menggunakan asam hidroklorat dan proses chemical bath deposition menggunakan asam stearat dengan variasi durasi etsa, konsentrasi larutan asam stearat dalam etanol, dan rasio mol asam stearat terhadap seng oksida. Nilai optimum dari modifikasi sifat permukaan berupa sudut kontak air dan sudut luncur air ditentukan menggunakan metode Taguchi yang dikombinasikan dengan assignment of weight untuk mengubah respon jamak menjadi respon tunggal. Hasil karakterisasi dengan Fourier Transform Infrared spectroscopy menunjukan bahwa asam stearat berhasil terdeposisi pada permukaan substrat. Hasil analysis of variance (ANOVA) menunjukkan bahwa rasio mol asam stearat terhadap seng oksida meningkatkan sudut kontak air secara signifikan. Kondisi optimal dari parameter proses ditentukan dengan menggunakan multi response performance index (MRPI) yang mewakili sudut kontak air dan sudut luncur air yang menunjukkan bahwa watu etsa selama 60 menit, konsentrasi asam stearat sebanyak 40 milimolar, dan rasio mol asam stearat terhadap seng oksida sebesar 0.08 merupakan parameter yang optimal. Energi permukaan yang rendah dihasilkan oleh methyl group (-CH3) yang memberikan permukaan hidrofobik, dan pengetsaan yang dipadukan dengan penambahan seng oksida meningkatkan kekasaran permukaan. Asam stearat juga menyebabkanperubahan sifat permukaan pada seng oksida sehingga diperoleh energi permukaan yang rendah dan kekasaran dalam skala mikro. Rasio mol asam stearat terhadap seng oksida menyebabkan pelapisan yang lebih baik pada permukaan seng oksida. Eksperimen konfirmasi yang dilakukan menghasilkan sudut kontak air rata rata sebesar 155.6° dan sudut luncur air sebesar 34.5° yang dianggap reproducible berdasarkan perbandingan confidence interval antara nilai yang terprediksi dan nilai eksperimen konfirmasi.
====================================================================================================================================
This study presents a novel approach to identify the optimal parameter to develop a temporary superhydrophobic coating on SS400 carbon steel substrates by coating them with stearic acid combined with zinc oxide to generate additional surface roughness. The coating was aimed to protect the SS400 carbon steel during storage and handling in the manufacturing industry. The surface modification process involved chemical etching using hydrochloric acid and chemical bath deposition using stearic acid with varying etching times, stearic acid concentrations in ethanol solution, and stearic acid to zinc oxide mole ratios. The optimum value of surface modification on the contact angle and water sliding angle was investigated using Taguchi`s method combined with the assignment of weight to convert a multi-response problem into a single-response problem. The Fourier Transform Infrared (FTIR) spectroscopy result indicates the succesful deposition of stearic acid on the substrate. THe analysis of variance (ANOVA) result showed that the stearic acid to zinc oxide mole ratio significantly enchants the water contact angle. Optimal conditions were investigated using the multi-response performance index (MRPI) of both the water contact angle and water sliding angle resulting in 60 minutes of etching time, 40 millimolar stearic acid concentration, and 0.08 stearic acid to zinc oxide concentration as the optimal parameters. The low surface energy surfaces generated from methyl group (-CH3) provide non-wetting properties on the surface, while the etching time combined with the addition of zinc oxide provides surface roughness. The stearic acid also provides surface modification on zinc oxide, which generates low surface energy and micro roughness. The higher stearic acid to zinc oxide mole ratio generates better coverage of stearic acid on the zinc oxide surface. The confirmation experiment that was conducted resulted in a 155.6° water contact angle and 34.5° water sliding angle which is considered reproducible based on the evaluation conducted using the confidence interval that partially overlaps between the predicted and the confirmation experiment.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Analysis of variance (ANOVA); multi-response performance index (MRPI); stearic acid; superhydrophobic; Taguchi’s method; zinc oxide. |
| Subjects: | T Technology > TS Manufactures > TS699 Powder coating of metals |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis |
| Depositing User: | I Wayan Padma Yogi Asana |
| Date Deposited: | 03 Aug 2023 06:13 |
| Last Modified: | 03 Aug 2023 06:13 |
| URI: | http://repository.its.ac.id/id/eprint/103101 |
Actions (login required)
 |
View Item |