What Does Surface Profile Gauge Mean?
A surface profile gauge is a type of profile gauge that measures the surface roughness of an object, usually to facilitate substrate preparation and the application of a protective coating. This tool records the roughness or cross-sectional shape that may be observed on a surface.
The surface profile gauge consists of a set of steel or plastic pins that are set tightly against one another in a frame that keeps them on the same plane while allowing them to move independently and perpendicular to the frame. When the pins are pressed against an object, they conform to the topography of the object's surface. By looking at the gauge, the technician can determine the height or depth of surface irregularities. The gauge can also be used to draw the profile on another surface.
The proper use of a surface profile gauge can improve a coating's overall performance and is a determining factor for how adhesion, coverage and overall volume of coatings are used. If there is an instance where the surface profile is too large, then the amount of coating needed increases. There is also the possibility that the peaks will remain uncoated, thus reducing the effectiveness of the coating and increasing the chances of future corrosion. Alternatively, when the surface profile is too small it results in insufficient coating adhesion, which leads to premature coating failure.
The profile height of a surface should be accurately measured to ensure that the correct surface preparation has been performed and to optimize coating usage performance. This parameter is essential as it determines the adhesion, coverage and overall volume of coating used.