Cleaning a circuit board requires everyday household items that even small companies can afford. If your PCB gets corroded from water damage or from another source, cleaning it may repair it. How to Clean Corrosion off a Circuit Board Eventually, excessive rust builds up and prevents the switch from activating. Fretting: With fretting corrosion, the action of closing solder-plated switches creates a wiping action that removes the surface oxide layer, allowing the layer beneath to oxidize.Electrolytic: In this type of metal degradation, adjacent traces experience dendrite growth when ionic contaminated moisture infects the electrical voltage between them, creating metal slivers that result in a short circuit.In these circumstances, the more resistant metal will actually corrode faster than the baser metal it’s in contact with, so when gold is in contact with tin, for example, the gold will corrode much faster than usual. Galvanic: Galvanic corrosion occurs when different types of metals are in the presence of an electrolyte.It does not, however, retain its electrical conductivity, so this is a big problem for circuit boards. Copper experiences atmospheric corrosion very easily, which is not a problem for copper plumbing because corroded copper retains its mechanical properties. Metal is exposed to moisture, which contains oxygen, causing a reaction where the metal ions bond with the oxygen atoms and create an oxide. Atmospheric: This is the most standard type of corrosion.There are several causes to why the metal in your circuit boards corrodes. What Are the Distinct Types of Corrosion That Can Occur? Metals that are extremely resistant to acid and corrosion, like gold and silver, are called noble metals, while those that are susceptible to corrosion, like copper and tin, are called base metals. Metals that are highly susceptible to corrosion include: Metals that are highly resistant to corrosion include: Some metals corrode almost immediately while some seem to never corrode. However, not all metals are created equal when it comes to corrosion. Since printed circuit boards are largely made of metal and are exposed to oxygen, they must corrode eventually. But why do printed circuit boards corrode, and what are some of the most common causes of PCB corrosion?Ĭorrosion is the process of oxidation that happens when oxygen bonds with metal, producing rust and causing the metal to flake off and lose its valuable chemical properties. A sufficiently corroded circuit board won’t work, and the steady advance of corrosion is inevitable. How to Clean Corrosion off a Circuit BoardĬorrosion is one of the major enemies of printed circuit boards.What Are the Distinct Types of Corrosion That Can Occur?.
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