共查询到20条相似文献,搜索用时 15 毫秒
1.
利用周浸加速腐蚀实验与力学性能实验对比研究了新型低碳贝氏体钢、超低碳铁素
体钢以及09CuPCrNi钢这3种钢在含氯离子环境中的耐腐蚀性能与拉伸性能的变化. 与超低
碳铁素体钢和09CuPCrNi钢相比, 新型低碳贝氏体钢不仅力学性能提高了, 而且耐腐蚀性
能亦得到改善, 其腐蚀速率明显低于其余2种对比钢, 并且随着腐蚀时间的延长其优势更加
明显. 3种钢的锈层具有相近的相组成, 但新型低碳贝氏体钢的腐蚀产物颗粒最细小且锈层
最致密, 同时在接近钢基体的锈层处Cr和Cu的富集程度最明显且Cl的含量最低. 新
型低碳贝氏体钢锈层阻碍氯离子透过能力高于其余2种对比钢锈层. 相似文献
2.
The corrosion resistance of ultra-low carbon bainitic steel 总被引:1,自引:0,他引:1
The corrosion resistance of ultra-low carbon bainitic (ULCB) steel was compared with a weathering steel 09CuPCrNi through accelerated corrosion tests. The results indicated that the corrosion resistance was almost the same for ULCB and 09CuPCrNi based on the weight loss. It can be seen that the grain refinement did not deteriorate corrosion resistance property. The homogeneous microstructure, lower carbon content and random distributing ∑3 boundary could effectively increase the corrosion resistance of the ULCB steel. The characteristics of the rust layers indicated that the inner rust layer contained nanocrystalline Fe3−xO4 particles, while copper and chromium alloying additions were enriched at the rust layer and substrate interface in ULCB steel. These factors played important roles in forming a compact protective rust layer. 相似文献
3.
碳钢和耐候钢在北京城市大气环境中初期腐蚀行为 总被引:1,自引:0,他引:1
对碳钢和耐候钢在北京城市大气中的初期腐蚀行为进行了研究.主要采用金相、扫描电镜、X-射线衍射方法分析和探讨了初期腐蚀层形貌、腐蚀产物和合金元素的分布.结果表明:在腐蚀初期,耐候钢表面生成的锈层较碳钢致密,裂纹和孔洞相对较少;25d后碳钢和耐候钢局部都出现了分层现象。腐蚀产物没有区别,差别主要是锈层中合金元素的作用.耐候钢锈层中有Cu、Cr合金元素的析出,聚集在裂纹处可抵御大气中水气及其有害离子的侵入,防止基体金属进一步腐蚀. 相似文献
4.
Influence of carbon content and microstructure on corrosion behaviour of low alloy steels in a Cl containing environment 总被引:1,自引:0,他引:1
Corrosion behaviour of low alloy steels (A and B) with different carbon content was studied by a salt fog test and an outdoor test. A commercial weathering steel 09CuPCrNi was used for comparison. The corrosion resistance of steels A and B with homogeneous microstructures was better than that of the commercial weathering steel 09CuPCrNi in the salt fog test. Steel A with an ultra-low-carbon content had far less weathering resistance than the other steels in the outdoor test. Selective corrosion of large pearlite produces stress in initial corrosion product films. Uniform corrosion product films with few cracks tend to form on homogeneous microstructures such as ferrite and bainite, and this is advantageous for the formation of a compact rust layer in the initial stage of atmospheric corrosion. However, uniform microstructures will result in over even interfaces between rust layers and bases, which will lead to frequent peeling of rust layers from bases because stress is induced by large temperature fluctuations and wet-dry alternations. Protection of the rust layer on a low alloy steel is dependent on the rust density and the bonding performance of the rust-base rather than the proportion of the rust phase in the initial stage of atmospheric corrosion. These results indicate that homogenous microstructures, proper amounts of carbon content and fine carbon-rich phases that are produced by appropriate processes are beneficial for the corrosion resistance of steels. 相似文献
5.
6.
The influence of the rust layers of carbon steel and weathering steel on the corrosion were investigated. It was found that corrosion of carbon steel slows down when its outer rust layer is removed. This phenomenon might be attributed to the shortening of the wetting time in wet–dry cycles when the outer rust layers are removed. What is more, growth time of the corrosion products is shortened as well, which results in the formation of the fine corrosion products. However, the behavior of corrosion of weathering steel is not obviously influenced by the outer rust layer and the wetting time. 相似文献
7.
8.
9.
在西双版纳热带雨林地区进行了4年的大气暴露试验,结果表明:材料的腐蚀符合指数函数规律,即W=Atn,随着试验时间的增加,腐蚀率有逐渐降低的趋势.碳钢的锈层疏松,易脱落,腐蚀较重;低合金钢的锈层比较致密,表现出较好的耐腐蚀性能. 相似文献
10.
<正> 为了解煤矿环境中微合金元素对提高轻轨钢耐蚀性的作用,本文试图对一种新研制的低合金轻轨钢36CuPCr,连同普碳轻轨钢和日本进口轻轨钢,在模拟煤矿矿水环境中的耐蚀机理进行探讨。 相似文献
11.
目的解决耐候钢裸露使用初期锈液流挂与飞散的问题。方法制备了新型耐候钢表面锈层稳定剂,通过周期浸润循环腐蚀试验、锈层微观分析和电化学测试等方法研究了在模拟海洋大气环境下,锈层稳定剂对耐候钢锈层结构及耐腐蚀性能的影响。结果表面锈层稳定化处理后,耐候钢表面生成的锈层区分为致密且连续的内锈层和外锈层。室内加速腐蚀168 h后,耐候钢的失重腐蚀速率由未处理的5.71 g/(m~2×h)降低到表面处理后的3.31 g/(m~2×h),失重腐蚀速率降低了约42%。耐候钢的锈层电阻由未处理的96?·cm~2提高到表面处理后的167.7?·cm~2,锈层电阻提高了约75%。表面处理后的耐候钢锈层中,Cr元素以α-(Fe_(1-x)Cr_x)OOH的形式存在于基体与锈层的界面处,Cr元素在内锈层与基体结合处发生聚集。结论新型锈层稳定剂可以明显改善耐候钢锈层结构,细化锈层晶粒,阻碍Cl~-的渗透,有助于耐候钢表面快速生成致密、连续且稳定的保护性锈层。 相似文献
12.
海水中碳钢内锈层中的微生物及其对腐蚀的影响 总被引:1,自引:0,他引:1
通过在海水中现场挂样,检测了碳钢内锈层中的硫酸盐还原菌(SRB)、异养菌、铁细菌和硫
氧化菌的数量,用SEM观察了内锈层中腐蚀性细菌的形态和分布,并测定了内锈层中的FeS含量,研究了内锈层中微生物对碳钢海水腐蚀的影响及碳钢内锈层中的微生物及其腐蚀与大型生物、锈层、温度等的关系.结果表明:碳钢在海水中暴露1~120个月,内锈层中有大量的硫酸盐还原菌聚集,同时有不同数量的异养菌、铁细菌和中性硫氧化菌存在;内锈层中有高含量的FeS,并随暴露时间的延长而增加.在青岛、榆林海水中暴露1个月,碳钢的腐蚀已经受到微生物,尤其是SRB的显著影响. 相似文献
13.
The corrosion behaviour of low-carbon bainitic weathering steel in an environment containing chlorine ions (Cl−) was studied by applying different constant elastic loads. The results showed that the applied elastic load reduces the resistance of the rust layer to Cl− diffusion because of the porous structure as well as the enhanced anion selectivity in the rust: this leads to more severe corrosion of the steel compared with load-free conditions. The corrosion rate increased with increasing loads. Corrosion enhancement can be attributed to mechanical-chemical interactions at the steel surface. 相似文献
14.
15.
暴露2年的碳钢与耐候钢表面锈层分析 总被引:13,自引:0,他引:13
测量了碳钢与耐候钢在海南地区大气中的腐蚀速率,分析了锈层的组成及合金元素的分布。结果表明,腐蚀2年的碳钢锈层是疏松多孔的块状锈层;耐候钢锈层是较致密的片状锈层,内锈层主要由α-FeOOH组成。疏松锈层含有S,致密锈层含有Cr。分析了两者在锈层中的作用。 相似文献
16.
通过中性盐雾腐蚀试验、电化学测试等手段研究了Q420qD超低碳贝氏体高强桥梁钢和其对比材料F500L-Z普钢在中性介质中的腐蚀行为.结果表明:Q420qD超低碳贝氏体高强桥梁钢的耐腐蚀性优于F500L-Z普钢;其电化学阻抗值随金属材料浸泡时间的延长而增大,说明随着浸泡时间的延长,金属材料表面锈层不断加厚,逐渐增加了阻挡电解液对金属材料的侵蚀及金属材料表面金属原子失去电子向溶液中迁移的过程. 相似文献
17.
18.
研究了低碳贝氏体钢在青岛曝晒一年后表面锈层的相组成、形貌、力学性能以及抗热震性能.结果表明:锈层由α-FeOOH、β-FeOOH、γ-FeOOH、Fe3O4以及非晶相组成;锈层的表面和截面形貌显示锈层较为致密,合金元素Cr和Cu在锈层中接近钢基体处有明显的富集现象;锈层的弹性模量和硬度随距锈层/钢基体界面的距离增大而降低;锈层/钢基体的结合强度和抗热震能力均高于锈层本身. 相似文献
19.
For 18 months, a newly developed low alloy weathering steel has been exposed in two coastal sites (Qingdao in the north China, Wanning in the south China). The different corrosion behaviors of the exposed side and the underside of the samples were characterized by X-ray diffraetion (XRD), polarization curve, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and N2 adsorption approach. It was found that the samples exhibited higher corrosion rate in Wanning than that in Qingdao. The underside of the samples corrodes more seriously than the exposed side in Qingdao, whereas the result in Wanning is just the reverse. The protection performance of rust layers mainly depends on its compactness and the enrichment of Cu and Cr is a secondary causation. The different compactness of rust layers in the exposed side and the underside originates from different corrosion conditions of the two sides. 相似文献
20.
应用电化学阻抗谱研究了在模拟工业大气的腐蚀溶液中Mn对耐候钢耐腐蚀性能的影响,并通过锈层电子探针面扫描验证了实验结果。电化学阻抗谱结果显示,在腐蚀初期高锰耐候钢表现出较强的点蚀反应特征,腐蚀后期则显示和比对钢相同的耐腐蚀能力。在模拟工业大气腐蚀条件下,Mn在耐候钢的内锈层中没有产生富集,Cr 和Cu在内锈层和钢基体界面中形成了富集带,这是保护性锈层生成的主要原因。 相似文献