排序方式: 共有16条查询结果,搜索用时 15 毫秒
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前已报导过1-(2-噻唑偶氮)-2,7- 二羟基萘(简称2,7-TADN)的合成及其在分析化学中的应用。本文研究了2,7-TADN与钴(Ⅱ)形成的配合物的极谱行为。在0.016摩尔NaOH溶液中,Co(Ⅱ)与2,7-TADN形成蓝色的二元配合物,它在-0.58伏处有一极谱波,但灵敏度不高。加入乙二胺后,不出现新峰,然而该处波高显著增加(图1)。经实验证明是Co(Ⅱ)-2,7-TADN-乙二胺三元配合物在汞电极上吸附所引起。利用此波可测定痕量钴。在0.005—0.2微克/毫升范围内,峰电流与钴(Ⅱ)浓度有良好的线性关系, 相似文献
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电镀不同钨合金抽油杆的耐盐水腐蚀性及力学性能 总被引:1,自引:0,他引:1
采用电沉积法,在35CrMo抽油杆表面制备了Ni-W-P和Fe-Ni-W合金镀层,研究了钨合金镀层及其热处理对抽油杆的耐蚀性和室温静态力学性能的影响.采用X射线衍射法表征了钨合金镀层及其热处理后的结构.采用失重法、阳极极化曲线测量和电化学阻抗谱,研究了电镀钨合金抽油杆在质量分数为3.5%的氯化钠水溶液中的耐蚀性.采用扫描电子显微镜分析了电镀钨合金抽油杆拉伸断裂后的断口组织形貌.结果表明:35CrMo抽油杆电镀钨合金后,其耐蚀性明显增强;热处理使镀层的耐蚀性进一步提高;各项力学性能均达到标准要求.电镀钨合金抽油杆可以应用于油田的采油设备中. 相似文献
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The microstructures, friction and wear behavior under dry sliding condition of electrodeposited amorphous Fe-Co-W alloy deposits heat treated at different temperatures were studied. A comparative study of hard chrome deposit under the same testing condition was also made. The experimental results show that the hardness and wear resistance of amorphous Fe-Co-W alloy deposits are improved with the increasing of heat treatment temperature, and reach the maximum value at 800℃, then decrease above 800℃. Under 40 N load, the wear resistance properties of the alloy deposits heat treated at 800℃ are superior to those of hard chrome deposit. The main wear mechanisms of amorphous Fe-Co-W alloy deposits heat treated below 600℃ are peeling, plastic and flowing deformation; when the deposits are heat treated above 700℃, they are plastic and flowing deformation. While the main wear mechanisms of hard chrome are abrasive wear, fatigue and peeling. 相似文献
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在含FeSO4·7H2O、Na2WO4·2H2O、NaH2PO2·H2O、Na3C6H5O7·2H2O、C6H8O7·H2O、NH3·H2O和苯亚磺酸钠的碱性镀液中,电沉积得到Fe–W–P三元合金,分析了不同镀液成分时所得镀层的化学组成,讨论了温度、pH、电流密度及NH3·H2O用量对镀层沉积速率和显微硬度的影响。结果表明:除NaH2PO2·H2O外,镀液中其他组分对镀层组成均有显著影响;工艺参数的改变对镀层沉积速率和显微硬度有一定影响,NH3·H2O体积分数对沉积速率的影响尤其显著。电沉积所得Fe–W–P合金镀层具有典型的非晶态结构,其耐蚀性略优于00Cr17Ni14Mo2不锈钢。 相似文献
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