铜合金在海水中的腐蚀行为研究

通过高速旋转腐蚀试验，X射线衍射，扫描电镜（SEM）及能谱分析（EDAX），高化学特征测定等对Cu-2,9Sn-0.9Al铜合金在人工海水中的腐蚀行为进行了研究，结果表明，添加2.9%Sn,0.9%Al的铜合金在室温，pH值为8．2的人工海水中具有较好的耐腐蚀性，其高耐蚀性主要是由于在合金表面形成一层氧化膜，它对阳极过程和阴过程都有影响，这层膜是Cu的氧化物和Sn的氧化物及Cu-Al-Mg共析化合物的复合保护膜，它们的协同作用降低了氧化层的孔隙度，从而避免了局部酸性区域的形成而导致的局部腐蚀。     

TB-19合金腐蚀性能研究

研究了高强亚稳β型钛合金TB 19的均匀腐蚀性能、耐冲刷腐蚀性能及应力腐蚀性能。结果表明,TB 19合金在60°C海水中经1000h均匀腐蚀试验后基本无腐蚀;在10m/s流速天然海水中,冲刷腐蚀速度仅为0.00029mm/a;在海水中的应力腐蚀强度因子为55.15MPa·m1/2,证明TB 19合金是一种耐蚀性能优良的高强钛合金。     

海水中泥沙对铜及铜合金腐蚀的影响

采用室内模拟加速试验装置,对紫铜,青铜,黄铜和白铜等几类铜及铜合金,在不同泥沙含量的海水中的冲蚀情况及腐蚀速度进行了研究,用实体显微镜观察检测表面的腐蚀形貌发现,泥沙的存在明显加速了铜及铜合金在流动海水中的冲刷腐蚀,表面莆成点蚀,局部体育馆和蚀坑,且对不同铜合金的腐蚀影响和规律不一致。     

国产B10合金耐海水冲刷腐蚀对比研究

为了改善国产B10合金的耐海水冲刷腐蚀能力,对其进行了改性,并对改性B10合金的化学成分、金相组织、耐海水腐蚀性能和防海生物污损性能等与德国产B10合金的进行了对比研究。结果表明,改性B10合金的耐海水腐蚀性能与德国产B10合金相当。此外,还介绍了改性B10合金产品在舰船上的实际应用情况。     

船用907钢表面化学镀耐冲刷腐蚀型NiMoB合金层的工艺参数优化

为提高船用907钢的耐冲刷腐蚀性能,设计了一种可与船用907钢海水管路内壁表面形成稳定化合物的NiMoB合金镀层,并采用正交试验优选了该化学镀液中NiCl_2,EDTA,Na_2MoO_4,KBH_4的浓度。采用扫描电镜观察合金镀层形貌;采用阻抗谱、极化曲线分析了合金镀层在模拟海水中的耐蚀性,并在模拟海水冲刷腐蚀环境下分析了Ni Mo B镀层的抗冲刷腐蚀特性。结果表明:不同的镀液参数对Ni Mo B镀层的性能影响较大,当NiCl_245.0g/L、EDTA 9.0 g/L、Na_2MoO_415.0 g/L、KBH_40.8 g/L,乙二胺45.0 g/L,NaOH 90.0 g/L时,NiMoB非晶态薄膜表面呈胞状物陈列,具有致密的表面形貌,镀层的耐腐蚀、抗冲刷腐蚀性能优良。     

铜及铜合金在泥沙海水中的腐蚀研究

介绍了 9种铜及铜合金在舟山海域暴露 1、2、4、8a的腐蚀结果 ,并通过室内模拟泥沙海水的加速腐蚀试验 ,研究了这些铜及铜合金在泥沙含量分别为 0 ,0 .75‰ ,1 .5‰的海水中的冲刷腐蚀行为及海水的泥沙含量对铜及铜合金的腐蚀形貌和腐蚀率的影响。结果表明 ,海水中泥沙的存在会加剧铜及铜合金的腐蚀 ,海水的泥沙含量对铜及铜合金腐蚀的影响程度随合金的不同有很大变化。     

Ti-Zr-Be-Cu-Co块体非晶合金在NaCl溶液中的冲刷腐蚀行为

为评价Ti基块体非晶合金的耐蚀性,以期今后在工业生产中的应用,采用失重法研究了Ti35Zr30Be2 4Cu7.5Co3.5块体非晶合金及其对应晶体成分在质量分数6%Na Cl溶液中0.2、0.4、0.6 m/s流速下的冲刷腐蚀行为.利用X射线分析(XRD)、扫描电镜(SEM)研究了Ti35Zr30Be2 4Cu7.5Co3.5块体非晶合金及其对应晶体成分的相结构、微观腐蚀形貌,并利用电化学极化试验测试2种合金冲刷腐蚀后的耐蚀性.结果表明:随着流速的增加,2种合金的腐蚀速度均升高,其中非晶合金出现最大腐蚀速度峰值的时间由无冲刷状态的32 h缩短到流速为0.6 m/s下的10 h,Ti35Zr30Be2 4Cu7.5Co3.5块体非晶合金腐蚀速度较对应晶体成分小;Ti35Zr30Be2 4Cu7.5Co3.5块体非晶合金较对应晶体成分在质量分数6%NaCl溶液中具有更好的耐蚀性.     

几种典型管路材料在流动海水中的冲刷腐蚀行为

为验证舰船中几种不同常用海水管路的耐冲刷腐蚀性能,测试了907钢、316L不锈钢、B10铜镍合金、TA2钛合金4种管路材料在不同海水流速下的耐冲刷腐蚀特性.通过腐蚀失重、电位测量、动电位极化手段分析了4种管路在1,3,5 m/s下的耐蚀性.结果 表明:TA2在1,3,5m/s流速海水冲刷下均未产生腐蚀失重,B10、31...     

不同流动体系中碳钢磨损腐蚀可比性的研究

采用管流式和旋转式两种流动模拟装置，研究了碳钢在单、双相流动海水中的磨损腐蚀。结果表明，在相同流速条件下，两种模拟装置所测得的碳钢流动腐蚀速度很难相同，流速不能准确描述流体流动对材料腐蚀的作用。而材料表面近壁处流体力学参数(表面切应力、传质系数)却与材料流动腐蚀本质相关。在保证动量、质量传递相似的条件下，从表面切应力、质量传递系数等参量入手，研究两种装置中实测的腐蚀速度的可比性和关联性是可行的。碳钢磨损腐蚀机理的研究表明：其腐蚀机制与流动模拟装置无关，在流动海水中溶解氧的传质是腐蚀的主要控制因素。     

耐海水腐蚀铸铁保护膜的形成

研究表明，对普通灰铸铁加少量合金元素及变质剂，可使使其耐海水腐蚀率提高４倍；这是由于在腐蚀过程中，铸铁表面形成了一层复合保护膜，对该膜的形成过程进行了探讨，发现了一些有意义的新现象。     

Pd-doped Sn-Ag-Cu-In solder material for high drop/shock reliability

Pd was chosen as a minor alloying element in a new Sn-1.2Ag-0.7Cu-0.4In solder alloy to improve the drop/shock reliability. The tensile properties and drop/shock reliability of the new Sn-1.2Ag-0.7Cu-0.4In-0.03Pd solder alloy was compared with those of the Sn-1.0Ag-0.5Cu and Sn-3.0Ag-0.5Cu alloys. The UTS, yield strength and elongation of Sn-1.2Ag-0.7Cu-0.4In-0.03Pd were superior to those of the other alloys tested. Sn-1.2Ag-0.7Cu-0.4In-0.03Pd showed outstanding drop/shock reliability compared to the representative Pb-free solder, Sn-3.0Ag-0.5Cu. Therefore, the Sn-1.2Ag-0.7Cu-0.4In-0.03Pd composition is assessed to be an alternative Pb-free solder composition that may replace Sn-3.0Ag-0.5Cu.     

SnAgCuBi无铅钎料对不同体积比SiCP/6063Al复合材料真空软钎焊接头组织和性能的影响

在不同保温时间下,分别采用 Sn-3.0Ag-0.5Cu 和 Sn-3.0Ag-0.5Cu-3.0Bi 无铅软钎料,对表面镀镍的两种不同体积分数的 SiCP/6063Al 复合材料进行真空软钎焊。通过剪切强度测试、显微组织分析、能谱分析等手段研究了钎焊接头的组织和性能。结果表明：Bi 元素的加入改善了 Sn-3.0Ag-0.5Cu 钎料的铺展润湿性,降低了熔点,提高了焊缝的抗剪强度;在270℃保温35 min 时,Sn-3.0Ag-0.5Cu-3.0Bi 钎料钎焊接头抗剪强度达到最高值38.23 MPa;钎焊过程中只是两侧镀镍层间的焊接,钎料并未透过镍层与母材发生扩散反应。     

Tensile properties and thermal shock reliability of Sn-Ag-Cu solder joint with indium addition

The thermal shock reliability and tensile properties of a newly developed quaternary Sn-1.2Ag-0.5Cu-0.4In (wt%) solder alloy were investigated and compared to those of ternary Sn-Ag-Cu based Pb-free solder alloys. It was revealed that the Sn-1.2Ag-0.5Cu-0.4In solder alloy shows better thermal shock reliability compared to the Sn-1.0Ag-0.5Cu and Sn-3.0Ag-0.5Cu solder alloys. The quaternary alloy has higher strength than Sn-1.0Ag-0.5Cu alloy, and higher elongation than Sn-3.0Ag-0.5Cu alloy. It was also revealed that the addition of indium promotes the formation of Ag3(Sn, In) phase in the solder joint during reflow process.     

Studying Cu Alloy Corrosion Products in Cooling Liquid

The effect of cooling liquid used for heat exchangers on the Cu alloy corrosion products has been examined using potential-time measurements under applied current condition (anodizing), potentiodynamic polarization, X-ray diffraction (XRD) and infrared spectroscopy (IR). The corrosion products formed on the Cu alloy surface during anodizing, are Cu2O, Cu-2(OH)(3)Cl, and Cu2S. NaCl is detected in the corrosion products. The film formation depends on the applied current and the shift of potential to nobler direction indicates its formation progress.     

Effect of Ni Content on Mechanical Properties and Corrosion Behavior of Al/Sn－9Zn－xNi/Cu Joints

The effects of Ni content on the microstructure and the wetting behavior of Sn-9Zn-xNi solders on Al and Cu substrates, as well as the mechanical properties and electrochemical corrosion behavior of Al/Sn-9Zn-xNi/Cu solder joints, were investigated. The microstructure of Sn-9Zn-xNi revealed that tiny Zn and coarsened Ni 5 Zn 21 phases dispersed in the β-Sn matrix. The wettability of Sn-9Zn-xNi solders on Al substrate was much better than that on Cu substrate. With increasing Ni content, the wettability on Cu substrate was slightly improved but became worse on Al substrate. In the Al/Sn-9Zn-xNi/Cu joints, an Al4.2Cu3.2Zn0.7 intermetallic compound (IMC) layer formed at the Sn-9Zn-xNi/Cu interfaces, while an Al-Zn-Sn solid solution layer formed at the Sn-9Zn-xNi/Al interface. The mixed compounds of Ni3Sn4 and Al3Ni dispersed in the solder matrix and coarsened with increasing Ni content, thus leading to a reduction in shear strength of the Al/Sn-9Zn-xNi/Cu joints. Al particles were segregated at both interfaces in the solder joints. The corrosion potentials of Sn-9Zn-xNi solders continuously increased with increasing Ni content. The Al/Sn-9Zn-0.25Ni/Cu joint was found to have the best electrochemical corrosion resistance in 5% NaCl solution.     

B10铜镍合金海水加速腐蚀行为

B10铜镍合金具有优良的耐海水腐蚀性能,为研究其在海水中的腐蚀行为,取厦门天然海水,加入双氧水作为腐蚀加速剂,在室内模拟海水全浸腐蚀实验,采用失重法、电化学阻抗谱(EIS)技术分析B10合金在海水腐蚀中的腐蚀速率随腐蚀时间的变化规律,用不同腐蚀周期的电化学阻抗谱特征来表征工作面积为1cm~2的合金表面氧化膜的生长破坏情况。结合扫描电子显微镜(SEM)、能谱分析(EDX)、XPS和拉曼光谱技术分析B10合金表面腐蚀产物膜的成分以及B10合金在海水腐蚀中的腐蚀类型。结果表明,氧化膜的生成与破坏使得合金在海水中的瞬态腐蚀速率呈先减小后增大的趋势,腐蚀产物包含碱式氯化铜Cu_2(OH)_3Cl和氧化亚铜Cu_2O,腐蚀由点蚀开始,逐渐经历了晶间腐蚀-剥蚀。     

Microstructural evolution,mechanical properties and corrosion behavior of as-cast Mg-5Li-3Al-2Zn alloy with different Sn and Y addition

Influences of Sn and Y on the microstructure,mechanical properties,and corrosion behavior of as-cast Mg-5Li-3Al-2Zn (LAZ532) alloy were investigated.The addition of Sn and Y refines grains and results in the formation of Mg2Sn and Al2Y phases,thus improving the mechanical properties of alloy by second phase strengthening and grain refinement strengthening.As-cast LAZ532 alloy shows typical filiform corrosion morphology,and the addition of Sn and Y does not change the corrosion mode of alloy.Ascast LAZ532-0.8Sn-1.2Y alloy shows excellent mechanical properties with yield strength of 166.2 MPa,ultimate tensile strength of 228.6 MPa and elongation of 14.8 ％,and exhibits the best corrosion resistance with the smallest corrosion current density and the lowest anodic dissolution rate.     

微弧氧化及包埋渗铝法制备的复合涂层高温抗蚀性能

采用包埋渗铝技术在C103铌合金基体上制备Al/C103,通过微弧氧化(MAO)处理获得Al_2O_3陶瓷膜外层。利用X射线衍射仪(XRD)和配有能谱仪(EDS)的扫描电镜(SEM),分析复合涂层高温腐蚀前后的成分和组织结构,并研究其高温氧化和热腐蚀行为与机理。结果表明:包埋渗铝处理的Al/C103经1000℃氧化10h后增重为6.98mg/cm^2,微弧氧化结合包埋渗铝制备的MAO/Al/C103增重为2.89mg/cm^2;氧化20h后,MAO/Al/C103增重为57.52mg/cm^2,高于Al/C103的28.08mg/cm^2。在900℃熔融混合盐(75%Na2SO4和25%NaCl,质量分数)中腐蚀50h后,Al/C103和MAO/Al/C103的增重分别为70.54,55.71mg/cm^2,表面生成了Al_2O_3和钙钛矿结构NaNbO3相;部分NaNbO3堵塞MAO微孔,阻碍熔盐向内扩散,MAO/Al/C103试样表现出较优的抗热腐蚀性。     

The effect of alkaline earth additions on the physical property and the corrosion behavior of Sn-0.7Cu-0.075Al solder alloy

Journal of Materials Science: Materials in Electronics - In this study, Sn-0.7Cu-0.075Al alloy (SCA alloy for short) was prepared by ball milling and vacuum melting. The effects of adding Sr and Ca...