铬酸盐

The resin was used as a selective oxidant for oxidation of allyl alcohol to allyl aldehyde.

合成了铬酸氢根季铵盐树脂，以它作为一种选择性氧化剂应用于烯丙醇的氧化反应，考察了温度、时间、溶剂、树脂与醇的物料比对氧化反应的影响。

Ammonium bichromate:Salt formed by neutralising chromic acid with ammonia.

重铬酸铵：氨与铬酸中和所产生的盐。

METHODS 3-methoxy-7α-methylestra-1,3,5(10)-trien-17β-ol was reducted with lithium and ammonia,then the intermediate was hydrolyzed in oxalic acid and reacted with malonic acid to get 3,3-dimethoxo-7α-methylestra-5(10)-en-17-ol(compound 4),which was oxidated by pyridium bichromate ,reacted with acetylene,and hydrolyzed in oxalic acid again to get the product tibolone.

方法以3-甲氧基-7α-甲基雌甾-1，3，5(10)-三烯-17β-羟基为起始原料经锂胺还原、草酸水解、缩酮化得3，3-二甲氧基-7α-甲基雌甾-5(10)-烯-17β-羟基(化合物4)，然后用温和的氧化剂重铬酸吡啶盐氧化、炔化、再水解得目的产物。

Pollution could be reduced by taking advantage of ion-exchange membrane electrolytic method to produce sodium dichromate.

为从源头解决铬盐生产中环境污染的问题，亟需探索清洁高效的重铬酸钠生产技术。

A conversion coating formed on magnesium alloy AM60 with a chromate-free bath mainly composed of silicate and tungstate is studied.

研究了以硅酸盐和钨酸盐为主的无铬化学处理液在镁合金上所形成的转化膜。

Any salt or ester of chromic acid .

铬酸形成的任何盐或酯。

A salt of the hypothetical dichromic acid .

一种假设的重铬酸形成的盐。

The trivalent chromium passivation film based on zincate plating obtained has compact structure with no obvious crack, and excellent anticorrosion performance. Different compositions are detected from the surface to inner film, the surface mainly contains Cr2O3-Cr3-ZnO compound, the inner (1030 nm to surface) composes of Cr2O3-ZnO-Zn.The forming process of passivation film possibly consists of four steps which are zinc dissolution, basic area appearance, gelatiniform film forming and converting to passivation film.

结果表明：锌酸盐镀锌层的三价铬钝化膜表面结构致密、无明显裂纹，具有较好的耐腐蚀性能；这种钝化膜表层与里层的组成不同，表层的组成为Cr2O3-Cr3-ZnO共混物；里层(离表层10~30 nm处)的主要组成为Cr2O3-ZnO-Zn共混物；钝化膜的成膜过程可能包括镀锌层的溶解、碱性薄层的形成、胶状膜的形成和胶状膜转化成钝化膜4个步骤。

A process of alkaline hard chromium plating on aluminum alloy was presented,including oil removal,dipping in heavy metal solution,acid pickling,dipping in zinc solution,hard chromium plating.

1前言铝合金电镀硬铬，是利用强碱性的锌酸盐溶液在置换锌层上直接镀铬，其工艺成熟，操作简便、易行。

Chromic dermatitis: A skin affliction resulting from attack on human tissues by salts of chromium and chromic acid.

铬毒皮肤炎：人体产皮肤组织被铬盐和铬酸感染而引致的皮肤病。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。