镍铬合金在酸性CuCl2溶液中反应机理

对铜在酸性CuCl_2溶液中蚀刻反应机理论述,利用氧化-还原电动势原理,详细论述了Ni80Cr20合金在酸性CuCl_2溶液中化学蚀刻反应机理,以及影响蚀刻速度的因素,并对溶液中金属离子的存在形式作了验证。     

锰铜基高阻尼合金中锌量的测定──硫氰酸盐萃取分离络合滴定法

基于甲基异丁基甲酮于稀盐酸介质中定量地萃取Ｚｎ￣（２＋）与ＣＮＳ￣－形成的络阴离子。从而达到与共存的锰、镍、铝、铬的完全分离。在有氟化物、硫脲存在时Ｆｅ￣（３＋）、Ｃｎ￣（２＋）和Ａｇ￣＋也不被萃取。有机相中的锌于ＰＨ５．５“六胺”缓冲介质中返萃取回水相，用ＥＤＴＡ滴定。在文中给定的条件下锌的一次被萃取率可达９９％以上，成功地解决了锰铜基高阻尼合金中共存离子对锌量测定的干扰问题。     

On the corrosion fatigue crack initiation model and expression of metallic notched elements

In the present study, attempts are made to extend the application of the mechanical model for the fatigue crack initiation (FCI) and the FCI life formula of metallic notched elements in laboratory air to those in the corrosive environment. The test results and analysis of the corrosion FCI (CFCI) life of aluminum alloys and Ti---6A1---4V show that the expression of the CFCI life obtained by modifying the FCI life formula in laboratory air can give a good fit to the test results of the CFCI life. The salt water (3.5% NaCl) environment has no effects on the CFCI resistant coefficient compared with the FCI resistant coefficient in laboratory air. However, 3.5% NaCl environment greatly decreases the CFCI threshold of aluminum alloy, but has little effect on the CFCI threshold of Ti---6A1---4V. The loading frequency ranging from 1 Hz to 10 Hz has no appreciable effect on the CFCI life, and thus, the CFCI threshold of aluminum alloys investigated. Hence, the expression for the CFCI life of metallic notched elements proposed in this study is a better one, which reveals a correlation between the CFCI life and the governing parameters, such as, the geometry of the notched elements, the nominal stress range, the stress ratio, the tensile properties and the CFCI threshold. However, this new expression of the CFCI life needs to be verified by more test results.     

COMPRESSION FATIGUE CRACK GROWTH BEHAVIOUR OF AN ALUMINIUM ALLOY: EFFECT OF OVERLOADING

Abstract— The behaviour of fatigue cracks in an Al-alloy under cyclic compression, either with or without overloads, was studied. For constant-amplitude compressive cycling, a non-catastrophic (saturation) character of the fatigue crack behaviour was confirmed, with the final depth of a crack depending on the applied load level. Single (tensile or compressive) intermittent overloads were shown to re-activate a previously arrested crack while reversed (tensile—compressive or compressive—tensile) ones were also shown to maintain continual fatigue crack extension under otherwise fully compressive cycling.     

PS,LS和煤油体系的界面张力

本文以石油磺酸盐(PS)、木质素磺酸盐(LS)和煤油体系为对象,研究了PS/LS比、盐度、醇、Na_2SiO_3及聚合物对体系界面张力(IFT)的影响,探讨了PS与各组分间的相互作用,结果发现,在一定盐度和混合醇(正丁醇+异丙醇)浓度下,PS/LS>0.3/0.7时,体系可形成中相微乳液,IFT值达1×10~(-3)mN/m左右;LS和聚合物的存在使IFT升高;在表面活性剂驱油体系中,可用廉价的LS部分代替PS。     

钨合金的各向异性及残余应力测试的可行性

Ｘ射线分析显示钨合金经旋锻后存在着择优取向性，据此探讨了残余应力测定的可能性，考察加工状态对不同晶面的应力常数和弹性模量的影响，实验表明选用ＣｏＫａ－（２２２）虽有织构干扰产生衍射强度的反常分布，但不破坏２θ与Ｓｉｎ＾２ψ的直线关系，仍适合应力测试。比较而言，选用ＦａＫａ－（３１０）可避免织构的影响。且因谱线尖锐，峰强度高更于实际测试，随着表面加工程度增加，半高宽值增大，应力常数值减小，弹性模量因     

铜线材酸性高速电镀致密光亮锡、锡铜合金

为了寻找低成本、低腐蚀、低污染高速电镀锡、锡铜合金工艺 ,在含光亮剂、柔软剂DL0 1、0 2、0 3的硫酸槽中在不同的电流密度、不同的搅拌速度下 ,在Φ0 .5mm的铜线上电镀Sn和Sn Cu合金镀层。DL0 1、0 2的主要成分是无芳香族的希夫碱 ,DL0 3的主要成分是醇醛缩合物。结果表明 ,在含有DL0 1、0 2、0 3和 35g/LSnSO4 ,137g/LH2 SO4 的镀液中 ,在Jc=10～ 90A/dm2 ,v=16 0～ 314m/min时 ,所得镀层致密、柔软、光亮。在含CuSO4 ·5H2 O 0 .5 ,3.5g/L的硫酸镀槽中 ,在Jc=9,18A/dm2 ,v=16 0m/min时获得了致密、柔软、光亮的Sn (0 .3%～ 0 .6 % )Cu合金镀层。     

Incoloy 800H合金的应用和性能分析

通过对耐热耐蚀合金Incoloy 80 0H的性能分析 ,指出它与普通奥氏体不锈钢相比具有较优的抗氧化性能、耐蚀性和高温蠕变强度。针对催化裂化装置同轴式沉降再生器内部所用Incoloy 80 0H焊件易出现裂纹的问题进行分析 ,认为在施焊过程中由于合金凝固时有低熔点金属或化合物的液态膜残留在晶界区 ,该合金具有高的焊接热裂纹敏感性 ,若焊材选择不当 ,焊丝填充不充分、缺少保护气等将导致晶间裂纹产生。提出了该合金采用TIG焊接防止热裂纹产生的措施。     

半固态ZnAl 27合金及其二次加热组织

研究了半固态ZnAl27合金及其二次加热组织。结果表明，半固态ZnAl27合金基本无宏观偏析，其组织为细小均匀的近球形非枝晶，综合力学性能远远高于常规铸造合金；二次加热后，α相进一步球化，边缘变得光滑圆整，可以满足半固态触变成形的需要。     

激光熔覆Ni基SiC合金涂层组织与性能的研究

利用5kWCO2连续波激光器在16Mn钢基材表面对含20%(体积比)SiC陶瓷粉末的镍基自熔性合金粉末进行激光熔覆得到Ni基SiC合金涂层(NiSiC)。研究了合金涂层的组织形貌及相结构,并用单纯的镍基合金涂层(Ni60)进行了显微硬度及滑动磨损性能的对比试验。结果表明,NiSiC合金涂层由γ枝晶及其间的共晶组织组成,主要组成相为γ-Ni,γ-(Ni,Fe)固溶体和(Cr,Fe)7C3,Cr23C6及(Cr,Si)3Ni3Si等化合物。添加SiC的镍基合金涂层NiSiC比单纯的镍基合金涂层Ni60具有较高的硬度和耐磨性。