Surface treatment technologies include mechanical polishing, electropolishing, acid pickling and passivation, and sandblasting. Mechanical polishing includes rough polishing, medium polishing, and fine polishing. Electropolishing uses electrochemical dissolution to preferentially dissolve microscopic protrusions on the surface, obtaining an ultra-smooth surface and improving corrosion resistance. Acid pickling and passivation are used to remove the surface oxide layer, forming a dense passivation film and restoring the material's inherent corrosion resistance. Sandblasting can obtain a uniform matte surface, improve coating adhesion, and eliminate surface stress.
Quality control and inspection cover dimensional inspection, non-destructive testing, and performance testing. Dimensional inspection uses calipers and micrometers to measure basic dimensions, coordinate measuring machines to inspect complex geometries, profilometers to inspect surface profiles, and optical measuring instruments for rapid inspection of large batches of products. Non-destructive testing includes radiographic testing (RT), ultrasonic testing (UT), penetrant testing (PT), magnetic particle testing (MT), and eddy current testing (ET). Performance testing includes hydrostatic testing, airtightness testing, intergranular corrosion testing, and mechanical property testing.
