Definition - What does Grit Abrasive mean?
A grit abrasive is a material, either metallic or non-metallic, that is used to cause wear on another material. A grit abrasive is typically used to remove coatings or oxide layers from a base material, or to polish a base material. A grit abrasive should be harder than the material it is being used to erode.
Grit abrasives are commonly used prior to coating. The grit abrasives remove oxide layers, previous coatings, or both. If this is not done prior to coating, then the adhesion of the new coating may be negatively affected, which will increase the corrosion rate. This is why it is very important to select the proper type of grit abrasive and delivery method for a given application.
Corrosionpedia explains Grit Abrasive
Grit abrasives can be delivered to the work piece through several different means. There are simple ways, such as rubbing sandpaper on a work piece. There are also more complicated methods, including surface grinding, grit blasting and wet polishing. These different methods all yield different results. The method of grit abrasive delivery should be considered with regard to quality and cost.
Grit abrasives must be harder than the material being worked on. Aluminum oxide and silicon carbide are two popular types of grit abrasives because of their high hardness. For very hard work pieces, materials such as diamonds and carbides must be use in order to ensure that abrasion will occur.