潘太军
,
鲁伟明
,
曾潮流
,
牛焱
金属学报
研究了Fe-8Cr, Fe-12Cr和Fe-18Cr合金在700℃含氯和两种硫含量还原性气氛中的腐蚀行为. 气氛中H2S含量增加导致合金发生加速腐蚀, 尤其造成Fe-18Cr合金表面氧化铬膜退化. 合金的加速腐蚀与膜中生成的硫化物和氯化物密切相关. 合金的腐蚀速率随其Cr含量的升高而降低. 通过计算气氛中平衡时的氯势、氧势、硫势预测了合金与气氛可能发生的反应, 并解释了腐蚀机制.
关键词:
Fe-Cr合金
,
oxidation
,
chlorination
,
sulfidation
,
null
,
null
张扬伟
,
李德俊
,
王富岗
腐蚀科学与防护技术
研究了高温时效前后的310不锈钢样品在气氛总压为1 05Pa，2.3%SO2/S2/8.8%N2气氛中600℃下的高温硫腐蚀行为.利用金相、扫描电镜/ 能谱及Ｘ射线衍射等分析其腐蚀形貌、成分及结构.结果表明：经时效处理的310不锈钢比未 时效处理者腐蚀严重，前者以晶间腐蚀为主，后者以均匀腐蚀为主.310不锈钢于700℃，100 00 h时效后在晶界大量析出σ相，使晶界附近贫Cr，降低了其抗硫腐蚀性能.
关键词:
310不锈钢
,
aging
,
σ phase
,
sulfidation
HUANG Yuanwei HAN Yong SUN Lanxiang XU Zhiqiang SHI Shengtai(S.T.Shih) Shanghai Institute of Metallurgy
,
Academia Sinica
,
Shanghai
,
China HUANG Yuanwei
,
Associate Professor
,
Shanghai Institute of Metallurgy
,
Academia Sinica
,
865 Changning Road
,
Shanghai
,
China
金属学报(英文版)
The effects of Y,Ce and La on the sulfidation of alloy Fe-25Cr-40Ni have been investigated. The sulfidation rate of the alloys with RE more than 0.1 wt-% is lower than that of the base alloy.The addition of Y is more effective than La and Ce in lowering the sulfidation rate. Based on the analyses of the structure and composition of the sulfide seales,the sulfidation mechanism of the alloys with RE has been proposed.
关键词:
sulfidation
,
null
,
null
,
null
张伟光
,
赵中伟
中国有色金属学报
目前钨冶炼企业广泛应用的除钼方法是基于钨钼与硫亲合力的差异，针对该方法中存在的钼硫化剂含硫量低且价格高的问题，提出以五硫化二磷P2S5作为新型硫化剂，通过其水解产生硫氢根为钼的硫化提供硫源的设想，并从热力学角度考察P2S5在水溶液中的水解过程及钨、钼的硫化行为。结果表明：P2S5水解产生钼硫化所需要的硫氢根；同时，在pH值7~9的弱碱性溶液中，n(S)/n(Mo)为8时，硫氢根可使溶液中的MoO42-完全硫化为硫代钼酸根，而WO42-几乎不被硫化。硫化过程中P2S5水解还将产生PO43-，在钨冶炼过程中可用现有技术除去。因此，在钨钼分离工艺中，P2S5有望成为一种新型高效的钼硫化剂。
关键词:
钨
,
钼
,
钼硫化剂
,
五硫化二磷
,
分离
,
水解平衡
,
硫化
,
热力学
刘兰兰
,
牛焱
中国腐蚀与防护学报
doi:10.11902/1005.4537.2013.169
研究了Fe-5Si,Fe-9Si和Fe-13Si合金在600℃下H2-CO2和H2-CO2-H2S两种气氛中的腐蚀行为.结果表明:在两种气氛中,3种合金的腐蚀均遵循近似抛物线规律;并且合金在含S和不含S气氛中的抛物线速率常数数量级分别为10-8和10-10g2· cm-4·s-1.在H2-CO2气氛中合金氧化膜由Fe的氧化物外层、Fe与Si的混合氧化物内层及Si的内氧化区组成;在H2-CO2-H2S气氛中则由层状的FeS外层和FeS+SiO2混合内层组成.两种气氛中合金均没有生成连续的SiO2外氧化膜.气氛中S的加入使合金表面生成了大量的FeS,FeS中较高的离子缺陷浓度为Fe2+向外扩散提供了通道,从而明显增大了合金的腐蚀速率.Si氧化物的生成提高了Fe在两种气氛中的耐腐蚀性.
关键词:
Fe-Si合金
,
硫化
,
氧化
,
S的作用
黄元伟
,
韩勇
,
孙兰祥
,
徐之强
,
石声泰
金属学报
研究了稀土元素Y,Ce和La对Fe-25Cr-40Ni合金高温硫化的影响。当合金中稀土含量为0.1wt-％时,合金的硫化速度明显降低。Y对降低合金硫化速度的影响大于Ce和La。加入Y的合金硫化时,在硫化内层优先形成带有保护性的较致密的硫化铬,它的晶粒较细,与基体很好粘着。在硫化层结构和成分分析的基础上提出了合金加入稀土元素后的硫化机理。
关键词:
硫化
,
rare-earth
,
sulfide scale
,
sulfidation rate
张仁刚
,
卓雯
,
王玉华
,
彭顺金
,
陈克亮
,
徐千山
人工晶体学报
以反应磁控溅射方法沉积ZnO薄膜,然后在空气和H2S气氛中退火制备了六方相ZnS薄膜.用X射线衍射仪(XRD)、紫外-可见透射光谱和扫描电子显微镜(SEM)对薄膜进行表征.提高空气退火温度能够改善ZnS薄膜结晶性,而空气退火温度超过500℃则会降低ZnS薄膜结晶性.另外,当硫化退火温度低于400℃时,ZnO只能部分转变为ZnS,只有硫化温度等于或大于400℃时,ZnO才能全部转变为ZnS.硫化前后薄膜晶粒尺寸有显著变化.所得ZnS薄膜在可见光范围的透过率约为80％,带隙为3.61 ～3.70 eV.
关键词:
ZnS薄膜
,
溅射
,
空气退火
,
硫化
NIU Yan
,
F.GESMUNDO
,
WU Weitao
,
ZENG Chaoliu
,
F.VIANI
,
(State Key Laboratory for Corrosion and Protection
,
Institute of Corrosion and Protection of Metals
,
Chinese Academy of Sciences
,
Shenyang.110015
,
China)(Istituto di Chimica
,
Facolta'di Ingegneria
,
Universita'di Genova
,
Fiera del Mare
,
Pad.D
,
16129 Genova
,
Italy)Manuscript received 3 July 1995
金属学报(英文版)
The corrosion properties of a Co-15wt% Y alloy were studied in H_2-H_2S mixtures under a sulfur pressure of 10-3 Pa at 600-800℃ and of 10-2 Pa at 800℃ to examine the effect of Y on the resistance of pure cobalt to sulfur attack at high temperatures.The alloy is nearly single-phase.containing mostly the intermetallic compound Co17Y2 plus a little amount of the solid solution of Y in cobalt.At 600-700℃ and at 800℃ under 10-2 Pa of S2 the alloy forms multi-layered scales consisting of an outer region of pure cobalt sulfide,an intermediate region of a mixture of the sulfides of the two metals and finally an innermost layer of a mixture of yttrium sulfide with metal cobalt.At 800℃ under 10-3Pa of S2,below the dissociation pressure of cobalt sulfide, the alloy forms only a single layer composed of a mixture of metallic cobalt with yttrium sulfide.Pure Y produces only the oxysulfide Y2O2S, as a result of the good stability of this compound and of the presence of some impurities in the gas mixtures used The corrosion kinetics is generally rather complex and irregular except al 800℃under 10-3 Pa of S2.The addition of yttrium always reduces the sulfidation rate of cobalt, even though the formation of a continuous protective external layer of yttrium sulfide is never achieved.The internal sulfidation of Y in Co-15% Y is not associated with a depletion of Y in the alloy.This kind of diffusionless internal attack is typical of alloys with a very small solubility of the most reactive component Y in the base metal A.which restricts severely the Y flux from the alloy towards the alloy-scale interface.
关键词:
:cobalt-yttrium alloy
,
null
,
null
