Effect of Corrosion Resistant Films Fabricated on an Al-Mg-Si Alloy Using Only Steam on Fatigue Life

Effect of molecular weight distribution of mineral oils on fatigue life of radial ball-bearings

Preparation of Zn1-xCrxO resistive switching film and its corrosion behavior in 3.5 wt.% NaCl solution

Corrosion resistance and ion exchange properties of montmorillonite film on AZ31 in SBF solution

The corrosion resistance of MoNb/AlNd/MoNb film during different sputter conditions was studied for G6 rotating target sputter equipment. The results show that with the increase of sputter power and the increase of the thickness, top MoNb tends to form coarse columnar crystals, and the corrosion resistance of the metal thin films, at first, increases and then decreases with the increase of sputter power and metal thickness. As the sputter temperature increases, top MoNb tends to form coarse grains while the corrosion resistance of the film is poor. The result also release that with the increase of the target speed, top MoNb film becomes loose so that it is difficult to play a protective role because of its poor corrosion resistance ability. Under the same conditions, the sputter of the planar target film is denser; as a result, the top MoNb layer can protect the inner AlNd layer from corrosion.

A series of thin films were formed on Pt by an MOCVD technique using Fe(III), Cr(III), and Ni(II) acetylacetonate. The corrosion resistance of the films was examined in and by measuring the film thickness using ellipsometry and the chemical analysis of test solutions with ICPS. The dissolution rate of composite films decreases exponentially with an increase in the cationic mass fraction of Cr3+ ions, , of the films, and at the values of larger than 0.7 it becomes two orders of magnitude lower than that of films. The same type of changes in the dissolution rate with was observed for the composite films. Therefore, the addition of to and films effectively improves the corrosion resistance. The addition of to composite films containing an adequate amount of does not bring an effective improvement in corrosion resistance. Therefore, the corrosion resistance of composite films is determined primarily by the content of the films.

Studies were made on the effects of temperature on the formation and corrosion resistance of boehmite films on aluminum by treatments in aqueous sulution and water vapor. The experiments were conducted by measurements of the film thickness, electron microscopy, electron diffractiometry, X-ray diffractiometry, and corrosion resistance.The following results were obtained.(1) The thickness of the film formed on aluminum in deionized water at 70°C or higher was different from that formed at 60°C. The former film had the same thickness, independent of temperature, except for at the initial stage of formation.The X-ray diffractiometry revealed that the film consisted of bayerite at 70°C or lower, amorphous substances at 80°C or higher, and boehmite and bayerite at 100°C.(2) In triethanolamine solution, the temperature gave a remarkable effect on the film thickness and the film was thicker with the rise of temperature. As the results of X-ray diffractiometry, it was found that the film in amorphous state when formed at 6090°C, but consisted of boehmite at 100°C.(3) In ammonia solution, the film was thicker with the rise of temperature at the initial stage of film formation. After 1hr., however, the film formed at 80 and 90°C showed the maximum in thickness and high corrosion resistance. The X-ray diffractiometry revealed that bayerite was detected in the film formed at 90°C or lower, and bayerite and hoehmite in the film formed at 100°C.(4) In water vapor treatment, temperature rise had a little effcet on the increase in the film thickness on alloys, but the film on the high purity aluminum was made thicker with the temperature rise, which increased the content of γs-phase in the film.However, there were no significant effects of treating temperature on the corrosion resistance of the film.

Effects of pore parameters on performance of anodic film on 2024 aluminum alloy

Conversion coating on zinc plating film using Cr (III) compound as main constituent were investigated. Corrosion resistance of the film were evaluated by salt spray test and measuring polarization resistance, Rp. Surface analysis were made to determine the elements on the film and depth profile by Auger electron spectroscopy (AES).Corrosion resistance of the passive film composed of both Cr (III) and silicate was better than those film consisting of each own component. With addition of phosphate and by post-treatment with dipping in colloidal silica sol solution, the corrosion resistance of the film was improved more. The evaluations of the film by measurement of polarization resistance were almost same results. The results of surface analysis using AES indicated that Cr (III) in the film was increased with addition of silicate, and that the thickness of the film was increased with addition of phosphate. These were thought to be responsible for improving the corrosion resistance of those Cr (III) film composed of silicate and phosphate.

Effect of SiO2 Sol Sealing on Corrosion Resistance of Anodic Films of AZ31 Mg Alloy

Abstract

In order to get a clear picture for describing the growth process of plasma electrolytic oxidation coatings under escalating voltage waveform, the characteristics of PEO coatings formed at different reaction stages were systemically investigated. The morphology and corrosion resistance of the films were studied by scanning electron microscope and potentiodynamic polarization curves. The uniform, semi-transparent and better corrosion resistance of the oxide films on the magnesium electrode surface were formed owe to the extended anodizing time at the initial stage under escalating voltage mode. After sparking occurred, generated ceramic coatings were brokedown, melted, cooled and solidified continuously, so the ceramic coatings were uniform and dense. It also exhibited superior corrosion resistance.

Improved corrosion resistance of MAO coating on Mg-Li alloy by RGO modified silanization

Thermal annealing effect on the corrosion resistance of AlCuNiTiZr high entropy alloy films in sulfuric acid solution

Silver is electroplated on the surface of connectors as a protective barrier layer in order to improve the corrosion resistance and to increase the durability of the connector. In this work, silver-graphene films were electrodeposited on copper–zinc alloy substrates from a succinimide silver-plating system in Hull-cell alkaline solutions by the addition of 0.4 g L–1 graphene oxide. The crystallographic structure and microstructure of the formed films were determined by X-ray diffraction and scanning electron microscopy, respectively. The corrosion resistance of the films was measured by a potentiodynamic polarization test. The results show that a low amount of graphene was incorporated into a silver deposit. The addition of graphene oxide could not influence the deposition rate and the crystallographic structure of the film, but resulted in a decrease in the size of aggregates or particles, compared with those of a pure silver film. The optimal current density was found to be 0.5 ~ 1.0 A dm–2, the surface of the films had a homogeneous close-packed fine-crystalline structure. The films were uniform, dense, and adherent to the substrate, without any evidence of delamination. At the same time, the addition of graphene oxide improved the corrosion resistance of silver films to a certain extent.

Achieving superior wear and corrosion resistance in FeCoNiCrNC films via nitrogen and carbon dual anions incorporation