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vchetian(½ð±Ò+30): 2010-03-28 15:51
sirljz(½ð±Ò+2):лл½»Á÷ 2010-03-28 20:11
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Originally posted by vchetian at 2010-03-28 11:05:03:
ÊÊÁ¿µÄREÄÜϸ»¯¾§Á£µÄÔ­ÒòÊÇÒòΪϡÍÁÑôÀë×ÓÄÜÌá¸ßÒõ¼«¼«»¯£¬ÓÐЧÌá¸ßµçÁ÷ЧÂÊ£¬ÒÔ¼°Ï¡ÍÁÑôÀë×ÓµÄÌØÐÔÎü¸½£¬Ò×ÓÚÎü¸½ÔÚ¾§ÌåÉú³¤µÄ»îÐÔµãÉÏ£¬¿ÉÒÔÓÐЧÒÖÖÆ¾§Á£Éú³¤£¬´Ó¶øÊ¹Í­²­¾§Á£Ï¸»¯£»µ«µ±RE³¬¹ýÒ»¶¨Á¿Ê±£¬ÓÉÓÚÏ¡ ...

The reason why an appropriate amount of RE can refine the grain is that the rare-earth cations can improve the cathode polarization,improve the current efficiency effectively, as well as the characteristics of rare-earth cation adsorption, and can be easily adsorbed on the crystal growth point, which can  inhibit grain growth effectively, thereby refining copper grain; But when RE is more than a certain amount,rare-earth metal cations can greatly increase the deposition rate, making the grain grew up too fast, so that the adsorption characteristics of RE will be weakened, resulting in loss of refinement effect.
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