STUDY OF EFFECT OF FREQUENCY AND ELECTRODEPOSITION TIME OF SUPERHYDROPHOBIC CU-ZN COATING PULSE ELECTROPLATING METHOD ON WETTING PROPERTIES AND ITS CORROSION CHARACERISTICS IN 3.5% NACL SOLUTION.

• Main Author: Fauzan Rafif, Ahmad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/77298
• Institution: Institut Teknologi Bandung

corrosion due to its relatively high surface-wetting nature. Currently, a lot of research is focused on minimizing surface wetting, and one approach is to create superhydrophobic coatings. Superhydrophobic coating has a static water contact ???????????????????????? ???????????????????????????????? ???????????????????? ???????????????????????? ???????????????????????? ???????????????????????????????? ???????????????????????????????????????????? ???????????????? ???????????????? ???????????????????????????????? ???????????????????????????? ???????????????? key factors in maximizing superhydrophobic properties. Fabricating superhydrophobic coatings through electrodeposition offers advantage in controlling surface morphology of the deposit. Electrodeposition using pulse electroplating provides minimum porosity, smooth deposits, and good current efficiency. This research investigates the influence of frequency and pulse current electrodeposition time on superhydrophobic coating fabrication and studies the characteristics of the coating at optimum parameters. A series of experiments were conducted, including sample preparation, pulse current electrodeposition, solution immersion, and surface modification. The varied parameters were the frequency (250, 500, and 1000 Hz) and electrodeposition time (50, 60, and 70 minutes). Cu-Zn was used as the coating deposit. Water contact angle testing was performed to determine the optimum fabrication parameters and assess the superhydrophobicity durability. Under the optimum parameters, tests were conducted to assess superhydrophobic properties on each sample has side, self-cleaning ability, immersion and electrochemical test in 3,5% NaCl solution, abrasion resistance, and characterization using X-Ray Diffraction and Scanning Electron Microscope-Energy Dispersive Spectrometry. The highest average water contact angle obtained ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? 1000 Hz and an electrodeposition time of 50 minutes. The water contact angle decreased with decreasing frequency and increasing electrodeposition time. This is attributed to the excessively rough surface morphology in both trends, which allows water droplets to penetrate the inter-particle gaps, reducing the water contact angle. The superhydrophobic properties deteriorated over time in open-air storage. Under the optimum conditions, the superhydrophobic properties were relatively homogenous on both sides of the coating and showed good resistance to abrasion up to a total distance of 50 cm, also good self-cleaning properties. The Cu-Zn superhydrophobic coating exhibited lower corrosion tendencies compared to bare steel. Immersion testing indicated a weight reduction of 0.5478 grams after 7 days. The morphology of the Cu-Zn superhydrophobic coating revealed flowerlike microstructures of CuO, along with nanostructures of ZnO and CuO clusters.