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 Threshold values for both pictures that result in matching the percentage on analysed light in the pictures as close as possible. 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, Mean Gray Value, Integrated Density. Area = Total umber of selected pixels. Mean Gray Value = The average intensity of the selected pixels. Integrated Density = Sum of the pixel values in the selection (area x mean gray value)
7. Frame the region of interest and right click and choose "Measure".
8. Results tab should appear.
9. Calculate reduction factor using integrated density: Reduction = ((Before−After)/Before)×100%

Results of Cleaning

• Sample 7: KS115 Isopropanol

Sample 7 before

Sample 7after

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

Reduction = 9.9%

• Sample 9: KS611 Isopropanol

Sample 9 before

Sample 9 after

Before:

- threshold 18
- included 7.02% of light histogram
- area: 121512, mean: 74.371, integrated density: 9036945

After:

- threshold 16
- included 6.87% of light histogram
- area: 120777, mean: 68.187, integrated density: 8235480

Reduction = 8.9%

• Sample 11: 105 96SC Isopropanol

Sample 11 before

Sample 11 after

Before:

- threshold 42
- included 7.03% of light histogram
- area: 265530, mean: 38.618, integrated density: 10254315

After:

- threshold 45
- included 6.94% of light histogram
- area: 280340, mean: 35.841, integrated density: 10047765

Reduction = 2.0%