Standard No.:	QB/T 3823-1999
Chinese Name:	轻工产品金属镀层的孔隙率测试方法
English Name:	Porosity testing method of the metal deposits for the light industrial products
Professional Classification:	A29 Material Protection
Professional Classification:	QB Professional Standard - Light Industry
Issued by:
Issued on:	1999-04-21
Implemented on:	1999-04-21
Status:	VALID
Language:	English
File Format:	PDF
Word Count:	3000 words
Price(USD):	90 (USD)
Delivery:	via email in 1-3 business day

1 Method to Paste Filter Paper

1.1 Principle
At room temperature, paste the filter paper dipped with some test solution on the surface of tested parts, if the deposits are subjected to pore or crack, then the test solution will react with the matrix metal or bottom metal deposits by penetrating through the pore or the crack and the compound which has a visible chromatism with deposits. The thus-generated compound penetrates on the filter paper and thus colored spots are caused on the filter paper; then determine the porosity according to the number of colored spots.
1.2 Test solution
The test solutions of different matrix metals and its deposits are listed in Table 1.