Flux Residual Activity Test
The flux residue activity test checks whether corrosive ions remain in the solder. This ensures the electrical and chemical stability of the component in long-term operation.
Physical-Chemical Mechanism of Action
The test measures whether ions such as chloride or fluoride are present in the solder. These ions can impair electrical insulation and cause corrosion.
Metallurgical Relevance & Welding Risks
If the test is positive, it means corrosive ions are still in the solder. This can lead to long-term destruction of the component and cause electrical issues like short circuits or conductivity drops. There is also a risk of hot cracking, as corrosive ions can affect the microstructure.
Workshop Practice & Instructions
Perform the test after soldering, before the component is put into service. Use a special measuring device that detects the presence of corrosive ions. If the test is positive, you must rework or replace the solder. Make sure all solder joints are clean and free of residues.