Magnetic performance and corrosion resistance of electroless plating CoWP film

The CoWP film with good magnetic performance and corrosion resistance was electrolessly plated from alkaline solution. The technical parameters of the electroless plating system were optimized. When the pH value of electroless plating solution was 11.0 and the reducing agent (NaH2PO2) content was 0.4 mol L 1, the target chemical reactions proceeded in the electroless plating solution smoothly with negligible interference and side effects. CoWP film prepared under optimal deposition condition contained more hexagonal close-packed (hcp) cobalt (ε-Co) of [110] and crystallographic orientation of Co [002]. VSM analysis reveals that the saturation magnetization of the CoWP film is 100～220 Am2 kg 1 and coercivity is (2.87～4.38)×104 A·cm 1. The corrosion behavior of CoWP film in 3.5% NaCl aqueous solution was studied by electrochemical experiments. The results prove that the corrosion resistance of the CoWP film deposited under the optimal depo-sition condition exhibites relatively lower corrosion current of (3.054～3.162)×10 6 A·cm 2. The surface morphology analysis indicates that the film is smooth and composed of regular-shaped crystallites.     

利用稳定同位素判断矿井水补给来源——以平禹一矿为例

用环境同位素技术研究地下水的补给是当前国内外较为新颖有效的方法之一。本文对研究区93个水样的稳定同位素18O值和D值进行了分析和计算。研究结果表明:矿区的岩溶水(包括矿井水)主要是来源于山区大气降水的补给;平禹一矿岩溶水主要来自于矿区北部和西北部山区岩溶水的侧向径流,直接水源为白沙水库地区的地下水;白沙水库一带地下水主要补给来源是当地大气降水。研究结果为该矿区采取有效的防治水措施提供了科学依据。