Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract： The corrosion performance of Ni free and Mn alloyed high nitrogen austenitic stainless steels (HNSSs), including uniform corrosion, intergranular corrosion, crevice corrosion, pitting corrosion and repassivation,was investigated by means of immersion test and electrochemical test. The effect of cold work and sensitization treatment on the microstructure, characteristic of passive film and corrosion resistance of the HNSSs was examined. It was found that the solution-annealed (SA) HNSSs had much weaker resistance to uniform- and intergranular- corrosion compared to the SA 316LSS. The sensitization- treatment (ST) hardly affected the uniform corrosion resistance of all the steels, but resulted in rapid degradation of the resistance to intergranular-corrosion, especially for the Mo free HNSSs. The SA HNSSs had a better resistance to crevice- and pitting- corrosion than the SA 316LSS, in particular the Mo bearing HNSSs. The ST degraded the resistance to crevice- and pitting-corrosion of the HNSSs. The cold work degraded the pitting-corrosion resistance of the HNSSs in chloride- containing solutions through thinning the passive film and decreasing the stable oxides in the passive film, but it improved the repassivation ability of the HNSSs. The ST-induced precipitation of χ phase degraded the corrosion resistance and repssivation ability of the HNSSs, and such degradation became aggravated with increasing cold work degree. Furthermore, the relevant corrosion mechanism is also discussed.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： none
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： none
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract： Polyurethane coatings with two kinds of sillitin, i.e. M type and Z type sillitin respectively as filler were prepared and sprayed on hot dip galvanized steel sheets. The coatings exhibited better mechanical properties than the simple polyurethane coating, i.e. the wear resistance and the hardness of the polyurethane coating may be enhanced by 57.1% and 14.5%, as well as 85.7% and 41.8% for the addition of M type and Z type sillitin respectively. The coatings with the two types of sillitin exhibited also better corrosion resistance. The reason is that two types of sillitin are of a special structure composed of micro- sized granular silica and nano- flake kaolin clay, and the sillitin possesses high amount of nanoflake, which may be beneficial to the enhancement of the permeation resistance and mechanical properties of the coatings.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract： The influence of flaky nickel powder as pigment on the permeation resistance of fluorocarbon based coatings was investigated by salt spray tests, EIS tests and measurement of water vapor transmission rate. The results show that among others the coating with a volume fraction 5% of flaky nickel powder exhibited the best comprehensive performance, however its resistance to water permeation degraded greatly for the coating with higher volume fraction of flaky nickel powder up to 15%.
Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-14 Cooperative journals: 《中国腐蚀与防护学报》
Abstract：以 NaCl+NaHSO3为腐蚀介质，通过浸渍干湿复合循环实验及腐蚀失重分析，并利用SEM，XRD和FTIR技术，研究了Q235 碳钢和P265GH 低合金钢的大气腐蚀行为。结果表明，两种钢的腐蚀遵从相同的动力学规律,腐蚀产物中均存在大量致密的FeOOH 和非晶态FeOOH，锈层具有很好的保护性，使得腐蚀速率降低。实验开始阶段两种钢的腐蚀量基本相同，但随着腐蚀的进行两者差距增大，P265GH 低合金钢比 Q235 碳钢的失重小、锈层致密、耐腐蚀性好。
Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-11 Cooperative journals: 《中国腐蚀与防护学报》
Abstract：通过循环盐雾腐蚀实验，模拟镀锌钢在酸雨环境中的腐蚀过程。采用腐蚀质量损失测试、扫描电镜(SEM)、X 射线能谱(EDS)和电化学技术分别对腐蚀48h、84h、132h、180h 和228 h的镀锌钢试样进行测试分析，得到腐蚀动力学、腐蚀产物成分、锈层截面形貌以及表面锈层的电化学特性，研究锈层对镀锌钢在酸雨条件下大气腐蚀的影响。动力学分析表明，腐蚀过程中镀锌钢的表面形成了具有较好保护性的锈层；电化学测试结果表明，锈层的保护性呈现随腐蚀时间的延长先增强后减弱的变化过程。
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