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关于厚板镀厚铜要求的电镀探讨与实践 被引量:2
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作者 肖云顺 《印制电路信息》 2008年第12期34-38,共5页
文章讨论了厚铜箔PCB板镀铜和图形电镀铜的生产制作工艺,指出厚铜箔PCB普遍存在的孔铜厚度不均匀和一般厚度偏低的解决途径和操作方案。
关键词 厚铜箔印制 金板镀 图形电 标准
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Effects of reflowing temperature and time on alloy layer of tinplate and its electrochemical behavior in 3.5%NaCl solution 被引量:6
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作者 黄先球 郎丰军 +3 位作者 马颖 陈宇 张昭 张鉴清 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第6期1978-1988,共11页
Effects of reflowing temperature and time on the alloy layer of tinplate and its electrochemical behavior in 3.5%NaCl solution were investigated by electrochemical measurements and surface characterization.It is found... Effects of reflowing temperature and time on the alloy layer of tinplate and its electrochemical behavior in 3.5%NaCl solution were investigated by electrochemical measurements and surface characterization.It is found that the amount of alloy layer increases with the increase of reflowing temperature and time.Then the corrosion potential of detinned tinplate shifts positively and the corrosion rate decreases.After being coupled with tin,the detinned tinplate acts as cathode and tin acts as anode initially.However,after being exposed for some time,the potential shifts of both detinned tinplate and tin reverse the polarity of the coupling system.The galvanic current density decreases with the increase of reflowing temperature and time. 展开更多
关键词 TINPLATE alloy layer reflowing process galvanic corrosion
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Electrodeposition of Ni-Cr alloy on aluminum substrate 被引量:6
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作者 杨余芳 龚竹青 +3 位作者 邓丽元 罗北平 马玉天 阳征会 《Journal of Central South University of Technology》 EI 2006年第3期219-224,共6页
Ni-Cr alloys with mass fraction of 1.4%23.9%Cr, 76.1%98.6%Ni, and hardness of 70.5 80.5HR were electrodeposited on aluminium substrate from the trivalent chromium sulphate-chloride solution using citric acid as comple... Ni-Cr alloys with mass fraction of 1.4%23.9%Cr, 76.1%98.6%Ni, and hardness of 70.5 80.5HR were electrodeposited on aluminium substrate from the trivalent chromium sulphate-chloride solution using citric acid as complexing agent. The aluminium was pretreated by means of degreasing and eroding, polishing and twice chemical immersion of zinc. The effects of electrodeposition parameters such as current density, temperature, pH value and bath concentration on the composition and hardness of deposits were investigated. The results show that the Cr content increases with the increase of current density and the decrease of temperature, and that it increases with the increase of pH value to a maximum and then decreases. The increase of Cr content leads to the increase of hardness of the Ni-Cr layers. The deposits with high Cr content are of good corrosion resistance. Good adherence of Ni-Cr deposits to aluminium substrate is obtained. The Ni-Cr alloys are the Ni-Cr solid solution with fcc crystalline structure. The Ni-Cr alloy deposits are fine, bright and smooth and compact. 展开更多
关键词 nickel-chromium alloy aluminium substrate ELECTRODEPOSITION
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Fatigue behavior of press hardened Al-Si coated high strength steel
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作者 Wang Zijian Gui Zhongxiang Zhang Yisheng 《Engineering Sciences》 EI 2014年第5期28-32,共5页
The fatigue behavior of press hardened Al-Si coated high strength steel has been investigated,and the fatigue strength turns out to be about 1 000 MPa.Surface morphology of fractured and non-fractured specimen has bee... The fatigue behavior of press hardened Al-Si coated high strength steel has been investigated,and the fatigue strength turns out to be about 1 000 MPa.Surface morphology of fractured and non-fractured specimen has been observed,and the coating shows significant influence on the fatigue behavior.The difference of elastic modulus between coating and substrate led to the main cracks perpendicular to the loading direction.The coating close to fracture exfoliated thinly,while the coating far away from the fracture kept integrated.Though the specimen was polished to obtain high surface quality,3 types of cracks occurred during the fatigue test.What’s more,inclusion particles were proved to play a crucial role in causing these cracks. 展开更多
关键词 fatigue behavior high strength steel Al-Si coating CRACK
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