Weekly PULSE Issue
Kaivan Karimi – Dir. of Global Strategy, Microcontroller Group, at Freescale
Electronics Quiz of the Day
Solder coating aging
Question:
Why is solder coating aging important?
Answer:
Part of the process to make sure components have good soldering characteristics is called aging.
There are a few ways to do this:
1: Dry heat: in air at 155 degrees C for 2-96 hours
2: Damp heat: in air at 40 degrees C and 93% relative humidity for 4-56 days
3: Steam: steam sometime mixed with air, oxygen, or sulphur dioxide
4: Cyclic damp heat: in air at 95% relative humidity, cycling between 25 dgrees C and 55 degrees C, with 9 hours at each temperature and 3 hours for temperature changes
The purpose of these processes is to affect the solderable coating of components to simulate normal aging or environments that might be encountered by the component before soldering.
Care must be taken to choose the correct process(es) for each type of coating, since none of these processes generate perfect analogs for real world aging due to differing interactions between coatings and gases.
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