公开(公告)号：US06329071B1

公开(公告)日：2001-12-11

申请号：US09431321

申请日：1999-11-02

申请人： Yuichi Kobayashi ,  Junichi Nagasawa ,  Shoichi Kamiya ,  Toshiyuki Fukaya ,  Hiromi Yamauchi ,  Kazuo Watanabe

发明人： Yuichi Kobayashi ,  Junichi Nagasawa ,  Shoichi Kamiya ,  Toshiyuki Fukaya ,  Hiromi Yamauchi ,  Kazuo Watanabe

IPC分类号： B32B1501

CPC分类号： C25D5/18 ,  C25D3/04 ,  Y10T428/12493

摘要： Using a chrome plating bath containing organic sulfonic acid, plating is conducted by application of a pulse current to thereby form a crack-free lower chrome layer on a steel substrate. The lower chrome layer has a compressive residual stress of 100 MPa or more and a crystal grain size of from 9 nm to less than 16 nm. Subsequently, by application of a direct current, a cracked upper chrome layer is formed on the lower chrome layer, to thereby obtain a chrome plated part. The lower chrome layer imparts the chrome plated part with heat resistance and corrosion resistance, and the upper chrome layer imparts the chrome plated part with wear resistance and good sliding properties.

摘要翻译： 使用包含有机磺酸的镀铬浴，通过施加脉冲电流进行电镀，从而在钢基材上形成无裂纹的下铬层。 低铬层的压缩残余应力为100MPa以上，晶粒尺寸为9nm以上且小于16nm。 随后，通过施加直流电，在下铬层上形成裂纹的上铬层，从而获得镀铬部分。 较低的铬层赋予镀铬部件耐热性和耐腐蚀性，并且上铬层赋予镀铬部件耐磨性和良好的滑动性能。

公开(公告)号：USRE40386E1

公开(公告)日：2008-06-17

申请号：US10401613

申请日：2003-03-31

申请人： Yuichi Kobayashi ,  Junichi Nagasawa ,  Shoichi Kamiya ,  Toshiyuki Fukaya ,  Hiromi Hieno ,  Kazuo Watanabe

发明人： Yuichi Kobayashi ,  Junichi Nagasawa ,  Shoichi Kamiya ,  Toshiyuki Fukaya ,  Hiromi Hieno ,  Kazuo Watanabe

IPC分类号： B32B15/01 ,  C25D5/14 ,  C25D5/18 ,  C25D3/04 ,  C25D3/10

CPC分类号： B32B15/01 ,  C25D3/04 ,  C25D3/10 ,  C25D5/14 ,  C25D5/18 ,  C25D5/48 ,  Y10T428/12493

摘要： Using a chrome plating bath containing organic sulfonic acid, plating is conducted by application of a pulse current to thereby form a crack-free lower chrome layer on a steel substrate. The lower chrome layer has a compressive residual stress of 100 MPa or more and a crystal grain size of from 9 nm to less than 16 nm. Subsequently, by application of a direct current, a cracked upper chrome layer is formed on the lower chrome layer, to thereby obtain a chrome plated part. The lower chrome layer imparts the chrome plated part with heat resistance and corrosion resistance, and the upper chrome layer imparts the chrome plated part with wear resistance and good sliding properties.

摘要翻译： 使用包含有机磺酸的镀铬浴，通过施加脉冲电流进行电镀，从而在钢基材上形成无裂纹的下铬层。 低铬层的压缩残余应力为100MPa以上，晶粒尺寸为9nm以上且小于16nm。 随后，通过施加直流电，在下铬层上形成裂纹的上铬层，从而获得镀铬部分。 较低的铬层赋予镀铬部件耐热性和耐腐蚀性，并且上铬层赋予镀铬部件耐磨性和良好的滑动性能。