You can try to download the E-version from internet.
 
Brs
 
Xie Jiwei


________________________________

	From: TGAsia [mailto:[log in to unmask]] On Behalf Of ext zgfeng
	Sent: Monday, July 30, 2007 4:41
	To: [log in to unmask]
	Subject: Re: [TGA] (瑞星提示-此邮件可能是垃圾邮件)Re: [TGA] (瑞星提示-此邮件可能是垃圾邮件)Re : [TGA] (瑞星提示-此邮件可能是垃圾邮件)[TGA ] 答 复: (瑞星提示-此邮件可能是垃圾邮件)[T GA ] 答复: [TGA]
	
	
	谢谢你,可惜在大陆看不到白先生的这本书。
	另外还想问一下,出现这种情况常常是无法在焊接前发现的,焊接后发现了损失也很大的,怎么样能在焊接之后判别是否是"Black pad"呢?
	 
	冯志刚

		----- Original Message ----- 
		From: Benjamin Chen <mailto:[log in to unmask]>  
		To: [log in to unmask] 
		Sent: Monday, July 30, 2007 4:08 PM
		Subject: (瑞星提示-此邮件可能是垃圾邮件)Re: [TGA] (瑞星提示-此邮件可能是垃圾邮件)Re : [TGA] (瑞星提示-此邮件可能是垃圾邮件)[TGA ] 答 复: (瑞星提示-此邮件可能是垃圾邮件)[T GA ] 答复: [TGA]


		各位好, 
		
		下列是參考白蓉生老師在其"電路板與無鉛焊接"(由台灣電路板產業學院出版)一書中第十章化鎳浸金無鉛銲點之強度關於黑墊的形成. 
		
		化鎳浸金的黑墊成分主要是製程後的磷與氧化鎳的複合物. 幾乎是現行ENIG製程再加上SAC高溫銲錫所很難避免的結果. 已經有一些公開的解決方案, 如利用一部分還原金代替全部換金, 或是在化鎳上鍍上薄化學鈀, 似乎是可行的替代方案, 不過更改製成的成本均相當高.  另外也有一些新的製程如錫銅鎳噴錫, 化鎳化銅上再加上薄的OSP似乎也是可替換ENIG的表面處理.
		
		詳細的黑墊形成原理, 白老師在其書中有詳述, 皆基於公開的論文資料, 大家看看應該會有所幫助 
		
		xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
		
		Benjamin Chen
		Regional Technical Coordinator, Asia-Pacific
		Consulting and Training
		Underwriters Laboratories Taiwan Co., Ltd.
		Tel: 886-2-2896-7790 ext. 62267, Fax: 886-2-2896-6140
		[log in to unmask]
		- Know by test, and state the facts. -
		Web site: http://www.UL.com.tw 
		
		
		
zgfeng <[log in to unmask]> 
Sent by: TGAsia <[log in to unmask]> 

07/30/2007 02:42 PM 
Please respond to
Asia Committe Task Group Forum <[log in to unmask]>; Please respond to
zgfeng <[log in to unmask]>


To
[log in to unmask] 
cc
Subject
Re: [TGA] (瑞星提示-此邮件可能是垃圾邮件)Re: [TGA]  (瑞星提示-此邮件可能是垃圾邮件)[TGA ] 答  复: (瑞星提示-此邮件可能是垃圾邮件)[T GA  ]  答复: [TGA]	

		




		"Black pad"和"黑盘"应该指的是同一种现象吧,可能是中文和英文的不同称谓。 
		  
		----- Original Message ----- 
		From: Benjamin Chen <mailto:[log in to unmask]>  
		To: [log in to unmask] <mailto:[log in to unmask]>  
		Sent: Monday, July 30, 2007 9:42 AM 
		Subject: (瑞星提示-此邮件可能是垃圾邮件)Re: [TGA] (瑞星提示-此邮件可能是垃圾邮件)[TGA ] 答 复: (瑞星提示-此邮件可能是垃圾邮件)[T GA ] 答复: [TGA] 
		
		
		請問指的是"Black pad"嗎? 
		
		
zgfeng <[log in to unmask] <mailto:[log in to unmask]> > 
Sent by: TGAsia <[log in to unmask] <mailto:[log in to unmask]> > 

07/27/2007 05:30 PM 

Please respond to
Asia Committe Task Group Forum <[log in to unmask] <mailto:[log in to unmask]> >; Please respond to
zgfeng <[log in to unmask] <mailto:[log in to unmask]> >



To
[log in to unmask] <mailto:[log in to unmask]>  
cc
Subject
Re: [TGA] (瑞星提示-此邮件可能是垃圾邮件)[TGA] 答 复: (瑞星提示-此邮件可能是垃圾邮件)[T GA ] 答复: [TGA]	


		


		
		
		
		ENIG工艺中有一种叫"黑盘"的现象,能解释一下是什么吗?看了资料说是由于P浓度过低引起的,会导致可焊性不良。多谢了! 
		 
		冯志刚 
		----- Original Message ----- 
		From: Gong Lijun <mailto:[log in to unmask]>  
		To: [log in to unmask] <mailto:[log in to unmask]>  
		Sent: Thursday, July 26, 2007 12:08 PM 
		Subject: (瑞星提示-此邮件可能是垃圾邮件)[TGA] 答复: (瑞星提示-此邮件可能是垃圾邮件)[T GA] 答复: [TGA] 
		
		     电镀镍金和化学镍金只是加工方式上不同,一个是化学镀一个是电镀,都有镍层和金层,厚度标准也够一样,镍层3-5微米,金层0.025-0.1微米。 
		     我个人的观点,局部可焊性不好,不会是这个加工过程引起的,是PCB问题的话,应该是阻焊显影时局部显影不净导致问题的可能性更大。 
		-----原始邮件-----
		发件人: zgfeng [mailto:[log in to unmask]]
		发送时间: 2007年7月26日 11:30
		收件人: Asia Committe Task Group Forum; [log in to unmask] <mailto:[log in to unmask]> 
		主题: Re: (瑞星提示-此邮件可能是垃圾邮件)[TGA] 答复: [TGA]
		
		谢谢两位的回复。 
		 
		还是有些不明白的地方,水金和沉金工艺除了工序不同以外,还有什么区别?是否沉金工艺中不镀镍?还是镀金层的厚度不同? 
		 
		回流焊后出现不润湿的情况后,用电烙铁手工加锡也不行,这可以反映出焊盘的可焊性应该是有问题。 
		另外,是否有可能是金层太薄,造成镍氧化,或是在镀金前镍已氧化?不清楚PCB工艺,乱猜的。 
		 
		冯志刚 
		----- Original Message ----- 
		From: Gong Lijun <mailto:[log in to unmask]>  
		To: [log in to unmask] <mailto:[log in to unmask]>  
		Sent: Thursday, July 26, 2007 11:14 AM 
		Subject: (瑞星提示-此邮件可能是垃圾邮件)[TGA] 答复: [TGA] 
		
		冯工: 
		   您好! 
		   您指的加工工艺应该是全板电镀水金(镍金)或全板化学沉金。不知具体是何种工艺。 
		   从PCB加工讲,化学沉金都是整板进行的,并且是在阻焊加工完成之后进行,如果出现可焊性的问题,逻辑上应该是全板都会出现不良,不会是局部的问题。因此焊接的工艺应该好好分析一下。 
		   如果是电镀水金会复杂些,由于是先整板镀镍金,然后再进行阻焊加工,镀金也是全板进行,局部的可焊性不好,不会是镀金过程引起的,但有可能会因为绿油显影不净出现局部可焊性不好的情况。具体还要仔细进行分析。 
		 
		   宫立军 
		   兴森快捷 
		-----原始邮件-----
		发件人: 李娅婷 [mailto:[log in to unmask]]
		发送时间: 2007年7月26日 10:54
		收件人: [log in to unmask]
		主题: [TGA] 

		冯先生: 

		      你好!镀金我们在业内一般称之为硬金,由于金层的致密性远高于化学浸金的金层,所以可能会出现局部的上金不良问题。但是我们公司的镀金工艺仅只有针对金手指的接插件,所以对于镀层的可焊性不良不是很清楚。 

		      如果是化金的板件,如果贵司加工的时候没有污染,就可能是供应商的问题了! 

		深南电路 

		李娅婷 

		
		
		

		--------- Original Message --------
		From: "Asia Committe Task Group Forum" <[log in to unmask]>
		To: <[log in to unmask]>
		Subject: [TGA]
		Date: 2007/07/26 10:45
		
		最近碰到一批板,焊盘表面是镀金处理,回流焊接后发现每片板上都有不同程度的不润湿现象,但在每块板上出现的区域不同,出现的位置也不同,同一片板上,有些位置润湿情况还是良好的(通过40倍放大镜观察)。 
		怀疑是PCB厂商在表面处理的工艺中做得有问题,不知镀金工艺中出现这种问题如何分析原因?还请快捷和深南的几位专家解答一下。 
		 
		 
		冯志刚 
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