The small rust areas exhibits only minor pinholing through the surface.
很小的锈迹，仅仅针眼大小。
2
Storing the tubes near mercury may cause amalgamation and pinholing of the tubes.
把管壁与汞一起存放，会导致“汞齐化”，并导致管壁穿孔。
3
This article relates the filming mechanics of powder coatings, discusses the influencing factors on the cratering and pinholing defects and gives measures to control the defects.