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2. Skin effect - Wikipedia

   en.wikipedia.org/wiki/Skin_effect

   Skin effect itself is not actually combatted in these cases, but the distribution of currents near the conductor's surface makes the use of precious metals (having a lower resistivity) practical. Although it has a lower conductivity than copper and silver, gold plating is also used, because unlike copper and silver, it does not corrode.

3. Galvanic corrosion - Wikipedia

   en.wikipedia.org/wiki/Galvanic_corrosion

   In other cases, such as mixed metals in piping (for example, copper, cast iron and other cast metals), galvanic corrosion will contribute to accelerated corrosion of parts of the system. Corrosion inhibitors such as sodium nitrite or sodium molybdate can be injected into these systems to reduce the galvanic potential. However, the application ...

4. Fretting - Wikipedia

   en.wikipedia.org/wiki/Fretting

   Fretting also occurs on virtually all electrical connectors subject to motion (e.g. a printed circuit board connector plugged into a backplane, i.e. SOSA/VPX). Commonly most board to board (B2B) electrical connectors are especially vulnerable if there is any relative motion present between the mating connectors. A mechanically rigid connection ...

5. Galvanic series - Wikipedia

   en.wikipedia.org/wiki/Galvanic_series

   When two metals are submerged in an electrolyte, while also electrically connected by some external conductor, the less noble (base) will experience galvanic corrosion. The rate of corrosion is determined by the electrolyte, the difference in nobility, and the relative areas of the anode and cathode exposed to the electrolyte.

6. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   A union also connects two pipes but is quite different from a coupling, as it allows future disconnection of the pipes for maintenance. In contrast to a coupling requiring solvent welding , soldering , or rotation (for threaded couplings), a union allows easy connection and disconnection multiple times if needed.

7. Solder alloys - Wikipedia

   en.wikipedia.org/wiki/Solder_alloys

   Prone to corrosion and oxidation due to its zinc content. On copper surfaces forms a brittle Cu-Zn intermetallic layer, reducing the fatigue resistance of the joint; nickel plating of copper inhibits this. [14] Sn 86.5 Zn 5.5 In 4.5 Bi 3.5: 174: 186 [18] Yes: No: Lead-free. Corrosion concerns and high drossing due to zinc content. Bi 57 Sn 42 ...