News Center-Jiangxi Fengcheng Xinying Metal Products Co., Ltd.

10-12

2019

Analysts see more copper prices volatile next week, pay attention to trade data

After the short holiday, although the US dollar index rebounded to suppress commodities, the Shanghai copper futures market remained stable this week under the support of the peak season effect, maintaining a narrow range of fluctuations. The total holdings of Shanghai copper futures remained at a record high level of more than 800,000, and the long and short positions were still in a stalemate without obvious direction signals. How will Shanghai copper futures go next week?

10-12

2019

Another innovative studio of China Copper wins provincial name

Recently, the Yunnan Provincial Federation of Trade Unions decided to name Xu Chengdong Innovation Studio as the second batch of "Yunling Craftsman Innovation Studio", which is the first batch of "Cloud Craftsmen Innovation Studio" named by Geng Jiasheng Innovation Studio by the Yunnan Federation of Trade Unions in 2018. After "Ling Craftsman Innovation Studio", China Copper Industry has won another honor in the construction of industrial workers in the new era. China Copper has also become the only unit in the province that currently has 2 "Yunling Craftsmen" and 2 "Yunling Craftsman Innovation Studios".

10-30

2020

Selection of copper plating process for "copper clad steel"

The particularity of wire processing industry makes its requirements for copper plating process different from that of conventional copper plating of steel parts. Therefore, how to choose a copper plating process suitable for wire processing is a very important issue. 通常选择电镀工艺的依据首先是施镀产品本身对镀层的要求。即先加工出产品，再进行电镀。比如厚度、光亮度、硬度以及分散能力等。有的还有对电流效率、沉积速度的要求。再就是看所需镀铜的预镀层、中间镀层和表面镀层。而线材加工电镀的特点是线材的加工过程和电镀过程有时是同步进行的。即有些是先拉后镀，有些是先镀后拉。即使是成品丝的电镀，也是在收线机的牵引下进行的。所选工艺除了根据线材的不同用途而对镀层有所要求外，还要考虑电镀工对线材行走速度、牵引的头数、加工线的长度等因素的适应性。对于CO2气体保护焊丝来说，由于对焊丝上的铜附着量有严格的限定，例如单位体积铜含量应在焊料的0．52(质量分数)以内，属极薄的镀层，选用化学浸入法即置换镀铜就能满足要求，但是由于目前国内采用的传统方法置换镀铜，其结合力、镀层色泽都不能满足产品要求。并且在实际中采用的是先浸镀再拉拔的工艺，使铜层在拉拔中延展而变薄，以达到产品要求。这种方法常常出现镀层脱落、露底现象。因此，选择有良好结合力和延展性的镀铜工艺就对于气保焊丝来说就十分重要了。在有新的能使成品丝一次化学镀铜成功的工艺出现以前，仍然只能采用先拉到中间线径，镀铜后再拉成成品的工艺。适合这种加工工艺的应该是氰化物镀铜或无光酸性镀铜。由于氰化物毒性太大，在冶金线材加工业中已经很少有人采用。目前较为流行的方法仍然是化学浸铜后再加厚镀铜再拉拔。所用的加厚镀铜为酸性镀铜或焦磷酸盐镀铜。在扁丝加工行业也多采用化学法镀铜。传统的置换镀铜用的是硫酸铜加硫酸的工艺。只有在很短的时间内可以有极薄的镀层置换出来，在上面镀铜加厚时，结合力不牢。如果在这种化学置换镀中浸的时间过长，不但不会增加镀层厚度，还会使镀层变得疏松多孔，铁基体还会发生腐蚀，线材强度大大下降。改进的方法是在置换铜镀液中加人具有表面阻滞作用的添加剂，使置换过程有序地进行。理想的添加剂还有一定的光亮作用。对于需要有一定厚度甚至较厚镀层的线材产品，采用置换镀层打底要十分小心。至少在尚无可靠适应厚铜镀层电镀的打底工艺之前，对于镀厚铜来说，可靠的工艺仍应采用电化学方法预镀。成熟的预镀工艺有氰化物镀铜镀镍和高P比的焦磷酸盐镀铜。权衡各种利弊，在拔丝电镀业，以镀镍作为预镀打底比较好。而加厚镀铜则可以采用酸性硫酸盐镀铜。这是因为经过工艺调整，酸性镀铜可以适应高速电镀的要求。电流密度可以达到30～50A／dm2，使沉积速度大大提高。相比之下，氰化物镀铜因为环境污染问题不宜采用，而焦磷酸盐镀铜因为成分复杂，不仅成本高，而且不适合在大电流下工作。测试表明，在酸性镀铜中高速电镀，当电流密度升高时，镀层的沉积速度也是同时增高的，其大致的关系见表1。

01-12

2021

Corporate Culture-Warm congratulations to Xinying FC for winning the 2020-2021 five-a-side League C championship in Yueqing

Warm congratulations to Xinying FC for winning the 2020-2021 five-a-side league championship in Yueqing

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