Non-toxic gold stripping liquid and method for detecting printed circuit board through non-toxic gold stripping liquid
A printed circuit board and gold stripping technology, which is applied in the field of non-toxic gold stripping liquid, can solve the problems of limited application range, high management and waste water treatment costs, and risky operation, and achieves simple configuration, fast gold stripping speed, Simple operation effect
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Embodiment 1
[0016] In the embodiment of the present invention, a non-toxic gold stripping solution and its application to printed circuit board detection method,
[0017] 1) Prepare 1L of A solution: pipette 10ml of 98% sulfuric acid, add it to deionized water to make a 1L solution, then weigh 80g of ferric sulfate, add it to the above solution to dissolve, that is, prepare 1L of A solution, brown container Keep airtight.
[0018] 2) Prepare 1L of B solution: weigh 60g of thiourea, add it to 1L of deionized water, that is, prepare 1L of B solution, and keep it sealed.
[0019] 3) Pipette 50ml of solution A and 50ml of solution B and mix to obtain 100ml of non-toxic gold stripping solution. The best effect is to use it within 2 hours, and it can be stored in a sealed and dark place to prolong its use time.
[0020] 4) Soak the test sample in the above non-toxic gold stripping solution. The stripping process can be taken out for observation. Depending on the thickness of the gold layer, th...
Embodiment 2
[0022] In the embodiment of the present invention, a non-toxic gold stripping solution and its application to printed circuit board detection method,
[0023] 1) Prepare 1L of A solution: pipette 8ml of 98% sulfuric acid, add it to deionized water to make a 1L solution, then weigh 40g of ferric sulfate, add it to the above solution to dissolve, that is, prepare 1L of A solution, brown container Keep airtight.
[0024] 2) Prepare 1L of B solution: Weigh 30g of thiourea, add it to 1L of deionized water, that is, prepare 1L of B solution, and keep it sealed.
[0025] 3) Pipette 50ml of solution A and 60ml of solution B and mix to obtain 100ml of non-toxic gold stripping solution. The best effect is to use it within 2 hours, and it can be stored in a sealed and dark place to prolong its use time.
[0026] 4) Soak the test sample in the non-toxic gold stripping solution, shake it for 30-60s, take out the sample, and then add the non-toxic gold stripping solution to the gold surfac...
Embodiment 3
[0028] In the embodiment of the present invention, a non-toxic gold stripping solution and its application to printed circuit board detection method,
[0029] 1) Prepare 1L of A solution: pipette 6ml of 98% sulfuric acid, add it to deionized water to make a 1L solution, then weigh 20g of ferric sulfate, add it to the above solution to dissolve, that is, prepare 1L of A solution, brown container Keep airtight.
[0030] 2) Prepare 1L of B solution: Weigh 17g of thiourea, add it to 1L of deionized water, that is, prepare 1L of B solution, and keep it sealed.
[0031] 3) Pipette 50ml of solution A and 75ml of solution B and mix to obtain 100ml of non-toxic gold stripping solution. The best effect is to use it within 2 hours, and it can be stored in a sealed and dark place to prolong its use time.
[0032] 4) In order to judge the corrosion degree of the nickel-phosphorus alloy layer, the reference sample and the test sample were stripped of the gold layer together. After the gold...
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