How do we usually clean lead-free solder paste after soldering?

How do we usually clean lead-free solder paste after soldering? Nowadays, this product is being used more and more widely in society. However, when welding with this product, problems such as chipping or difficult cleaning may occur. In such cases, how can we choose to avoid or clean it? Moreover, there are more and more manufacturers of this product in society, and most people don't know how to choose. Let's listen to some suggestions here below:

Everyone knowsLead-free solder pasteIt is a substance with very active chemical properties, so it has very strict requirements for the environment, generally in terms of temperature2~10℃And the temperature is20%Under the conditions of both sides, the shelf life is6After a month, there may be some impurities remaining after the welding is completedPCBSo, how to clean it off?

First of all, we need to know why cleaning is necessary. After lead-free solder paste is soldered, there will be some residue to some extent, and the residues can be classified into several types:

1Particulate pollutants are prone to cause electrical short circuits.

2, Polar contaminants can cause dielectric breakdown, leakage and corrosion of component circuits, etc.

3Non-polar contaminants can affect the appearance, mainly due to white powder adhering to dust and causing poor electrical contact.

Secondly, although it was realized that cleaning was necessary, the incorrect cleaning method was used, as follows: 

1When ultrasonic waves are not available, simply soak the circuit board and then take it out to dry.

2Use a brush dipped in cleaning agent to scrub the circuit board a few times.

After the welding is completed, there may be some impurities remainingPCBSo, how to clean it off?

First of all, we need to know why cleaning is necessary. After lead-free solder paste is soldered, there will be some residue to some extent, and the residues can be classified into several types:

1Particulate pollutants are prone to cause electrical short circuits.

2, Polar contaminants can cause dielectric breakdown, leakage and corrosion of component circuits, etc.

3Non-polar contaminants can affect the appearance, mainly due to white powder adhering to dust and causing poor electrical contact.

Secondly, although it was realized that cleaning was necessary, the incorrect cleaning method was used, as follows: 

4When ultrasonic waves are not available, simply soak the circuit board and then take it out to dry.

5Use a brush dipped in cleaning agent to scrub the circuit board a few times.

So how should it be cleaned?

1It should be cleaned as soon as possible after welding(1Within one hour);

2Increase the preheating temperature of the cleaning agent;

3Extend the cleaning time;

4Replace the cleaning agent frequently with new ones.

After cleaning, it would be best for us to check again to see if everything has really been cleaned thoroughly. The simple method is to take visual inspection and observe under a microscope.

When choosing a solder paste manufacturer, everyone should select a product based on their own products. Currently, our company's lead-free solder paste and lead-free solder wire are widely used in the market, for exampleLEDPrinting die bonding Manufacturer The ultrafine nano tin powder manufacturer demands tin balls, and the power capacitor manufacturer demands special tin wires for the zinc surface of power capacitors. The effect after use is also very satisfactory.

Shenzhen JJY Technology Co., Ltd. has a solid technical foundation and strong production capacity. The company is located in Longhua Qinghu Science and Technology Park5000Duoping's production base strictly implementsISO9001System. Multiple inspection procedures ensure the stable performance of tin materials. Raw materials are inspected upon entry into the warehouse, products are inspected upon exit from the warehouse, and samples are taken for tin melting and finished products to test whether the formula meets the standards and is environmentally friendly. All environmental protection products have passedSGSTest, in complianceRoHSInstruction, carELVInstructions andREACHStandard.