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Interest in electrocodeposition of nickel-based composite coatings has increased in recent years due to their unique combination of wear, magnetic, electrical, and corrosion properties (Ref 1). In general, composite coatings reinforced with hard oxide or carbide particles such as Al2O3, TiO2,SiO2, SiC, and WC or even diamond improves their wear resistance and reduces friction wear (Ref 2-4). Non-metallic inclusion such as WC and SiC in the metal changes its electron structure and crystal lattice that result in changes in the physical and mechanical properties of the electro-deposits(Ref 5, 6). On the other hand, metallic deposits such as carbon black (CB) and carbon nanotubes (CNT) incorporated in the metal through electrocodeposition result in formation of clusters. The electric fields are stronger around the CB/CNT clusters, than in other areas, which may result in increased local deposition rates and higher current densities. Under higher current densities, the differential depositing rates lead to a coarser surface. This may affect the mechanical properties of the composite coatings (Ref 7). |
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kunlunlx(½ð±Ò+60, ·ÒëEPI+1): лÁË£¬À´µÄºÜ¼°Ê± 2011-06-02 09:28:39
Mally89(½ð±Ò+1): ¸ÐлӦÖú£¡~ 2011-06-02 20:48:56
kunlunlx(½ð±Ò+60, ·ÒëEPI+1): лÁË£¬À´µÄºÜ¼°Ê± 2011-06-02 09:28:39
Mally89(½ð±Ò+1): ¸ÐлӦÖú£¡~ 2011-06-02 20:48:56
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Mally89(½ð±Ò+3): ¸ÐлӦÖú£¡~ 2011-06-02 20:49:09
Mally89(½ð±Ò+3): ¸ÐлӦÖú£¡~ 2011-06-02 20:49:09
| Interest in electrocodeposition of nickel-based composite coatings has increased in recent years due to their unique combination of wear, magnetic, electrical, and corrosion properties (Ref 1). ½üÄêÀ´£¬Äø»ù¸´ºÏ¶Æ²ãµç»¯Ñ§¸´ºÏ¹²³Á»ý¼¼ÊõÓÉÓÚÆä¶ÀÌØµÄÄÍÄ¥ÐÔ¡¢´ÅÐÔ¡¢µçѧºÍ·ÀÐâÊ´ÌØÐÔ¶øÈÕÒæÒýÆð¹Ø×¢¡£In general, composite coatings reinforced with hard oxide or carbide particles such as Al2O3, TiO2,SiO2, SiC, and WC or even diamond improves their wear resistance and reduces friction wear (Ref 2-4).ͨ³£¶øÑÔ£¬¸´ºÏ¶Æ²ãµÄ¿ÉÓÉÓ²Ñõ»¯Îï»ò̼»¯Îï΢Á£ÈçAl2O3, TiO2,SiO2, SiCºÍ WCµÄ¼ÓÈë¶øµÃµ½¼ÓÇ¿£¬Éõ»ò½ð¸Õʯ¼ÓÈëÒà¿É¸ÄÉÆ¶Æ²ãµÄÄÍÄ¥ÐԺͼõÉÙÄ¥Ëð¡£ Non-metallic inclusion such as WC and SiC in the metal changes its electron structure and crystal lattice that result in changes in the physical and mechanical properties of the electro-deposits(Ref 5, 6). ½ðÊôÖеķǽðÊô¼ÐÔÓÎïÈçWCºÍSiC¸Ä±äÁ˽ðÊô²ÄÁϵĵç×ӽṹºÍ¾§¸ñ½á¹¹£¬µ¼Öµç³Á»ýÎïÎïÀíºÍÁ¦Ñ§ÌØÐԵı仯¡£On the other hand, metallic deposits such as carbon black (CB) and carbon nanotubes (CNT) incorporated in the metal through electrocodeposition result in formation of clusters.ÁíÒ»·½Ã棬½ðÊô³Á»ýÎÈçͨ¹ýµç»¯Ñ§¸´ºÏ¹²³Á»ý¼¼Êõ°üº¬Ì¿ºÚºÍ̼ÄÉÃ×¹ÜÔÚ½ðÊôÖÐÕßµ¼Ö´صÄÐγɡ£ The electric fields are stronger around the CB/CNT clusters, than in other areas, which may result in increased local deposition rates and higher current densities. Ì¿ºÚ/̼ÄÉÃ׹ܴØÖÜΧµÄµç³¡Ç¿¶È¸ßÓÚÆäËûÇøÓò£¬¿ÉÄܵ¼Ö¾ֲ¿³Á»ýÂÊÔö¼ÓºÍ½Ï¸ßµÄµçÁ÷Ãܶȡ£Under higher current densities, the differential depositing rates lead to a coarser surface. Ôڽϸߵľֲ¿µçÁ÷ÃܶÈÏ£¬²îÒ컯µÄ³Á»ýÂÊÔì³É±íÃæ´Ö²Ú¡£This may affect the mechanical properties of the composite coatings (Ref 7).Õâ¿ÉÄÜÓ°Ï츴ºÏ¶Æ²ãµÄÁ¦Ñ§ÐÔÄÜ¡£ |
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