查询词典 trivalent

The hazards of hexavalent chromium electroplating, and the benefits of trivalent chromium electroplating were analyzed.

分析了六价铬电镀的危害及三价铬电镀的优点，以及三价铬电镀取代六价铬电镀带来的效益。

The development history of trivalent chromium passivation for zinc plating was overviewed.

概述了镀锌三价铬钝化的发展历程。

Company's products are now available through the ISO9001: 2000 international quality management system and ISO14000: 2004 environmental management system certification, the use of trivalent chromium plating process, the quality has reached the European environmental standards.

公司产品现已通过ISO9001：2000国际质量管理体系及ISO14000：2004环境管理体系认证，采用三价铬电镀工艺，品质已达到欧洲环保标准。

Trivalent chromium and hexavalent chromium are the predominant chromium species in the natural environment.

其广泛的运用在各大工业中，也因此铬的职业暴露所造成的危害为人所注目。

Relating to compounds in which arsenic is trivalent.

关于含有砷的化合物，尤指含有三价砷。

A trivalent metallic element of the rare earth group; usually occurs in association with yttrium.

一种稀土属的三价金属元素，通常与钇共生。

Zinc passivating; Blue white; Trivalent Chromium; High corrosion resistance

锌钝化；蓝白色；三价铬；高耐蚀

Zincate plating ; trivalent chromium ; passivation ; corrosion resistance ; electrochemical behavior

镀锌；三价铬；钝化；耐蚀性能；电化学行为

It includes the following steps: extract trivalent iron ion and divalent iron ion in water phase through organic extractant, get predecessor of; absterge it with secondary distilled water for2-3 times and get pure load metal predecessor of organic phase; mix organic phase of Mg2 and Fe3 with mol rate of 1:2 and introduce them into autoclave, add distilled water according to the rate of 3:1 or 4:1 of organic phase and water phase and airproof it, and then mix it fiercely, stripping with hydrothermal method at temperature between 200 degree C and 300 degree C and make them react for 2.5 hours; cool it to the room temperature under natural condition, separate liquid and centrifugalize it, absterge it with absolute alcohol for 2-3 times and dry it at temperature of 50 degree C for 30-180 minutes, then get product of magnesium ferrite.

包括如下步骤：通过有机萃取剂来萃取水相中的三价铁离子和二价镁离子，制得有机相前驱物；用二次蒸馏水洗涤2-3次，获得纯净的负载金属有机相前驱物；按照Mg 2 和Fe 3 摩尔比1∶2将有机相混合均匀后引入高压釜中，按照有机相与水相的比例为3∶1或4∶1加入蒸馏水，密封后，对溶液进行强力搅拌，水热反萃的温度在200-300℃之间反应2.5小时；自然冷却至室温，分液，离心分离，用无水乙醇洗涤2-3次，在50℃下干燥30-180分钟，得铁酸镁产品。

A soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process.

一种软质的黄白色三价金属元素，稀土属，能通过离子交换过程从氟碳锑矿或独居石中重新获

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。