Tag Archive | defect

Why does capillary flow or scavenging occur when I apply conformal coating to my PCB?

Capillary flow in conformal coating is where the coating pulls or runs away from certain areas of a PCB to more favourable sectors due to a combination of effects, leaving a patchy finish on the surface of the board.

To learn more click Common Failure Mechanisms in Conformal Coating Capillary to find out more.

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How does delamination or lifting of my conformal coating occur and how can I stop it?

Delamination in conformal coating is where the coating lifts from the surface of the PCB, leaving the area below exposed.

To learn more click Conformal Coating failure mechanisms Delamination to find out more.

Why does my conformal coating crack during my coating process?

Cracking in conformal coating is where the smooth surface of the coating fractures into sections with the cracks leaving the area below exposed to potential contaminants.

To learn more click Conformal Coating failure mechanisms cracking to find out more.

What is de-wetting and why does it occur in my conformal coating process?

De-wetting is the tendency of the conformal coating material to refuse to wet the surface of the printed circuit boards and components that it has been applied to evenly.

To learn more click Conformal Coating failure mechanisms_de-wetting to find out more.

How does corrosion occur even when I am using a conformal coating to protect my printed circuit board?

In conformal coating, there are several mechanisms that cause failure of printed circuit boards (PCBs). One of these failure mechanisms is corrosion.  This is defined as the chemical or electrochemical reaction between a material, usually a metal, and its environment that produces a deterioration of the material and its properties.

To learn more click Conformal Coating failure mechanisms Corrosion to find out more.

What is the conformal coating failure mechanism “orange peel” and why does it occur?

In conformal coating, there are several mechanisms that cause failure of printed circuit boards (PCBs). One of these failure mechanisms is Orange Peel.  This is defined as an uneven textured surface, often appearing dull, which looks like the skin of the orange.

To learn more click Conformal Coating failure mechanisms Orange Peel to find out more.