Report

Cleaning and stress tests done to solder flux samples

Cleaning

Each sample was wiped for 30 seconds with the corresponding cleaning agent. In the case Tickopur an ultrasonic bath was used at 30°C temperature for 10 min each step and a rinse in DI water.

Sample numbers corresponding to the flux type and cleaning done

Analysis Steps for ImageJ

Steps:

1. Open images before & after.
2. Image -> Type -> 8-bit
3. Select a square frame around sample
4. Choose the same Threshold value for both pictures. All above threshold 255, all below 0.
5. Note!!! This threshold includes different percentage of picture light for different pictures.
6. Analyze -> Set measurements -> Area (area = sum of number of pixels that have non-zero values).
7. Frame the region of interest and right click and choose "Measure".
8. Results tab should appear.
9. Calculate reduction factor:

Reduction = ((Before−After)/Before)×100%

Results of Cleaning

• Sample 7: KS115 Isopropanol

Before:

- threshold 20 
- included 6.61% of light histogram
- area: 148996, mean: 64.895, integrated density: 9669090

After:

- threshold 26
- included 6.51% of light histogram
- area: 152096, mean: 57.270, integrated density: 8710545

Sample 7 before

Sample 7after