共查询到20条相似文献,搜索用时 93 毫秒
1.
2.
3.
4.
5.
6.
7.
冷轧辊辊坯普遍采用电渣钢锭制造,但生产成本高、产品规格受限。试验采用真空精炼钢锭替代电渣锭制造冷轧辊辊坯。通过真空精炼钢、氩气保护浇注、两镦两拔、高温均致化及附加一次830~840℃重结晶调质加热淬火等工艺措施生产出了合格的冷轧辊。 相似文献
8.
9.
10.
11.
12.
13.
14.
15.
《有色金属再生与利用》2009,(4):1-1
清风徐来,繁花盛开,挡不住这个世界忙碌而又混乱的脚步。有评论称,金融危机的爆发证明二战后建立起来的全球秩序框架是失败的,于是G20伦敦金融峰会被普遍认为是一个重建国际经济秩序的转折点,乐观的说法是——新兴经济体将在新秩序中拥有更多话语权。 相似文献
16.
Passivity and transpassivity of nickel in hydrofluoric acid electrolytes The anodic behavior of nickel in hydrofluric acid solutions has been investigated under potentiostatic and galvanostatic conditions. The polarisation curve differs clearly from the curve in sulfuric acid. Four current density maxima are observed, the last one lying at about 2.5 VH. In the vicinity of the corrosion potential and after the last three maxima the electrode is covered by dark surface layers. Slight pitting occurs after the second maximum. Under galvanostatic conditions positively and negatively damped oscillations can be observed before the first three maxima. This phenomenon indicates that similiar mechanism are responsible for the formation of the maxima. The investigation shows that the passivity of nickel cannot be explained by the interaction of metal and water alone, but also depends on the nature of the dissolved anion. 相似文献
17.
18.
19.