Detection Content

Detection Purpose: Coating water resistance, salt water resistance, solvent resistance, acid resistance, alkali resista

Detection range: Epoxy powder, polyethylene coating and galvanized coating

Coating:


Coating is a solid continuous film obtained from a single application of coating. It is a thin plastic layer coated on metal, fabric, plastic and other substrates for protection, insulation, decoration and other purposes. Coatings can be gaseous, liquid, solid, usually according to the need to spray the substrate to determine the type of paint and state.


Corrosion resistance test of coating:


Coating corrosion test is generally divided into: salt spray test, heat and humidity test, immersion test.


Immersion test is the test sample immersion in liquid medium, this is the most convenient test method, to test the coating water resistance, salt water resistance, solvent resistance, acid resistance, alkali resistance and other corrosive media. , in general is part of the sample in medium of liquid surface, above the liquid film to the erosion of vapor, liquid impregnation, part of the film resistance to medium under especially in the boundary position of the air and liquid, the liquid surface oxygen concentration is high, the metal sample as cathode and alkaline, the model of the following parts of the metal anode, formed by the oxygen concentration is low. Therefore, in the immersion test, the sample paint film in the liquid face is most vulnerable to alkaline damage and corrosion.