Direct growth of Mg-Fe layered double hydroxide (LDH) film on SUS-316L surface and its corrosion resistance in 0.85M H2SO4 aqueous

• Main Authors: Wen-Ji Liao, 廖文吉
• Other Authors: Jun-Yen Uan
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/pjwfs3

碩士 === 國立中興大學 === 材料科學與工程學系所 === 99 === This research main on direct growth of oriented Mg–Fe layered double hydroxide (Mg-Fe LDH) film on the surface of SUS-316L. According to the polarization test, to investigate the Mg-Fe LDH film could enhance the corrosion resistance. Corrosion current density (I(corr)) of the Mg-Fe LDH film in aqueous 0.85M H2SO4 was lower than raw materials (SUS-316L) obviously. The sample was bubbling CO2 into solution at the pressure of 4.0 kPa and the corrosion current density was less than 1.0μA/cm2. It shows the film caused the sample of the Mg-Fe LDH film on SUS-316L has much more corrosion resistance. In addition, this research also investigate that growth of the Mg-Fe LDH sheet structure were affected by controlling the pressure of bubbling CO2 into solution.The picture of the Scaning Electron Microscope (SEM) exhibited that the area of the sheet structure of the Mg-Fe LDH was as larger as the pressure of the bubbling CO2 was higher. After the sample were test in the slat-fog during 60 days,there were no any erode or partial peeling in Mg-Fe LDH sheet structure. The cross-cut tape test for testing the adhesion of the Mg-Fe LDH film on SUS-316, none of the square of the lattice were detached. According to ASTM D3359 standard, the result was ranked as 5B and it was suggested that the Mg-Fe LDH coating adhered excellently on the surface of the SUS-316L.