Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract： Self-assembly monolayers of hexadecane-thiol (HDT) were prepared on the surface of silver and their anti- tarnishing performance was examined by accelerated tarnish test with H2S. Then the optimal processing parameters were acquired: the temperature is 60 ℃, the concentration of HDT is 0.1 mol/L and the experiment time is 2 h. The self-assembly monolayers were characterized also by means of water drop contact angle, polarization curve, electrochemical impedance spectroscopy and cyclic voltammetry methods. The results showed that the self-assembly monolayers of HDT on the surface of silver were compact, and the effect of anti-tarnishing for silver is excellent. Both anodic and cathodic reactions of corrosion were inhibited by HTD SAMs, the film coverage is 94.8%, and the inhibition efficiency is up to 95.9%.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract： The self-assembled monolayers (SAMs) of hexadecane-thiol (HDT) were prepared on silver surface in ethanol solution. The adsorption behavior of HDT SAMs on silver surface and their corrosion inhibition were investigated by means of polarization curve, reflectance, EPMA, AFM and XPS. The results indicate that the HDT SAMs are dense and stable and do not affect the original appearance of silver, while exhibit also excellent inhibiting effect. In the solution with 0.05 mol/ dm3 Na2S, the inhibition efficiency is up to 91.7% for the HDT SAMs prepared in the ethanol solution with 0.1 mol/dm3 HDT. The polarization curve shows that HDT acts as a mixed type inhibitor with cathodic inhibition as dominative action. The adsorption of HDT on the silver surface obeys the Langmuir adsorption law and contains both physisorption and chemisorption.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-19 Cooperative journals: 《金属学报》
Abstract： Magnetron sputtering ion plating (MAIP) is limited by the low density and low ionization of target atoms, which results in that the films deposited by MAIP have poor compactness, low adhesion and the quick decreasing in thickness along the target-to-substrate distance, so this disadvantages of the film quality and property can not satisfy the harsh need of modern society. Based on the physical gas discharging plasma theory, the gas discharge could be introduced into the glow-arc discharge section between the glow discharge and the arc discharge by increasing the target current density. By means of the collision kinetic energy of Ar+ and the Joule heating effect of electrons, the electrons and atoms could be spontaneously induced to emit by overcoming the surface work function. Thus the deposited particles with a high density, a high energy and a high ionization can be obtained. Two groups of the Ti films were deposited in glow discharge and glow- arc discharge sections respectively. The film thickness at different target- to- substrate distances was measured by the CLSM. The microstructure of films was characterized by XRD, SEM, AFM and TEM. The adhesion between the film and substrate was determined by the microscratch tester. The results showed that the Ti film deposited in the glow-arc section of gas discharge had nanocrystal size, dense structure, uniform thickness, high deposition rate and excellent adhesion.
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