Thermal Spray Pretreatment - Summary of Sandblasting Points

       1) The type of parts or base materials to be blasted. The material of the parts or substrates to be sandblasted can be metals such as steel, stainless steel, copper, aluminum, titanium, lead, etc., or non-metallic materials or organic plastics. The blasting material should not chemically react with the substrate material and will not contaminate the substrate surface. For example, for sandblasting the surface of aluminum and aluminum alloys, it is not recommended to use steel nine or broken steel sand, because it will bring iron pollution to the surface of the aluminum alloy; while sandblasting iron-based heat-resistant alloys, it is not suitable to use sic sand, because sic sand May react spontaneously with iron, resulting in strong chemical wear. Especially when blasting soft or brittle materials, such as Al, Mg, Cu, and Be, it is necessary to fully estimate the serious damage that hard abrasive blasting may cause to the surface.



    2) The surface state of the base material. Whether the surface of the component or base material is carburized, nitrided, chrome-plated or painted. If a similar treatment has been done, the blasting will not work well and the paint will contaminate the blasted abrasive.

    3) The size and shape of the substrate. For the sandblasting of thin-walled parts, improper control may cause deformation of the parts; for workpieces with complex shapes, the accessibility of the parts to be sandblasted should be considered. Generally, blind holes, deep holes, inner walls of small-diameter pipes and other parts are difficult to Not even sandblasted.

    4) The accuracy and tolerance requirements of the substrate. Sandblasting should not be carried out when the substrate has been finished in place and the toleranc