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My company has some plastic enclosures with circuit boards inside. The board has been exposed to corrosion, which we will repair and test for continuity and current. Is there a test that can test for "longevity" or durability of the trace? For example, we repair a trace, tests good for continuity/current, how long with the trace last (is the test we need).

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  • \$\begingroup\$ If you are doing this commercially you need to have some idea of what you are doing, without asking here. Hire somebody that knows what they are doing. \$\endgroup\$ – RoyC Mar 2 '17 at 16:44
  • \$\begingroup\$ How are you going to know before hand how much corrosion is going to be affecting the trace? I'll bet there is variation. Secondly wouldn't it better to find a preventative measure that stops the corrosion? \$\endgroup\$ – Voltage Spike Mar 2 '17 at 17:18
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    \$\begingroup\$ conformal coat, salt spray and elevated temps. oxidation is a large variable, condensation another \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Mar 2 '17 at 17:42
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    \$\begingroup\$ no clean flux is still very corrosive and I have lost many laptops due to this especially iPads, Mac Air, Acer Ferrari. Review flux cleaning process. \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Mar 2 '17 at 17:52
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As has been stated in comments, the answer is a deafening no!.

Corrosion on pcbs can be caused by any number of things, and leftover flux from your repair process is a real danger. Otherwise, corrosion rates will depend on environmental conditions, and you have no good way to model these.

Worse, your repair process seems to be aimed at repairing corrosion damage which has actually caused a failure. If one part is being corroded, the odds are that others have been affected as well, and are just waiting to go south. These hidden failure points can be in any state of damage.

Since the products your company works on have (by definition) suffered corrsion damage, it is clear that they will continue to suffer damage, and so you need to take measures to prevent this above and beyond what the original product produced. Tony Stewart is correct in recommending conformal coat, not to mention testing. This might be overkill for "regular" products, but the nature of your problem indicates that more stringent measures are appropriate.

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