The quality inspection of color-coated plates is mainly the inspection of coating pretreatment and coating performance. The pretreatment inspection of coating includes two aspects of degreasing degree and chemical conversion coating. The detection of coatings includes two aspects: the mechanical properties of the coating (such as adhesion, flexibility , impact strength, hardness, gloss, etc.) and the special properties with protective functions (such as weather resistance, acid and alkali resistance and oil resistance ). Among them, mechanical properties are the basic routine properties that need to be tested in coating quality testing, while special properties with protective functions can be selectively tested according to different application requirements. There are relevant testing standards for the inspection of the above two performances in the country .
A coating pretreatment performance testing standard
(1) GB/T 11376- -1997 "Metal Phosphate Conversion Coating";
(2) GB/T 17460- -1998 "Chemical Conversion Coatings on Aluminum and Aluminum Alloys with Rinse and Non-Rinse Chromate Conversion Coatings";
(3) GB/T9792--1988 "Gravimetric method for measuring the mass of upper and lower film layers per unit area of conversion film on metal materials";
(4) GB/T 13312- 1991 "Test method for degreasing degree of steel parts before painting (oil test paper method)";
(5) GB8923--1988 "Steel surface corrosion grade and rust removal grade before painting";
(6) GB/T 12612- -1990 "General Technical Specifications for Multifunctional Steel Surface Treatment Fluid";
(7) CB/T 13288- -1991 "Assessment of Surface Roughness Grade of Steel before Painting (Comparison Sample Method)"
B Standard for Coil Coatings and Thinner Performance Testing
(1) GB3186- -82 (1988) Sampling of paint products;
(2) GB/T 1723- 93 paint viscosity determination method;
(3) GB 1724- -89 (79) Determination of paint fineness;
(4) GB 1725- -89 (79) Determination of solid content of coatings;
(5) GB6750-86 method for determining the density of paints and varnishes;
(6) GB 6753. 3- -86 Test method for storage stability of coatings;
(7) GB/T 1721 Determination of appearance and transparency of varnishes, varnishes and thinners;
(8) GB/T 1722- -1992 Varnish, varnish and thinner color determination method;
(9) GB/T 1751 Determination of whitening properties of diluents and moisture-proof agents;
(10) GB/T 1751 Determination of water content of diluents and anti-humidity agents.
C coating film performance testing standard
(1) GB/T 13448- -2006 "Test methods for color-coated steel sheets and strips";
(2) GB 1720 -89 (79) "Determination of Paint Film Adhesion";
(3)) GB/T 1731- 93 "Determination of flexibility of paint film";
(4) GB/T 1730-93 "Determination of impact resistance of paint film";
(5) GB/T 1730-93 "Paint Film Hardness Determination Method Pendulum Damping Test";
(6) GB5210- -85 "Determination of Coating Adhesion Pulling Method";
(7) GB/T 6739--1996 "Coating Hardness Pencil Determination Method";
(8) GB 1743- -89 (79) "Determination of Paint Film Gloss";
(9) GB 1743- -89 (79) "Determination of Abrasion Resistance of Paint Film";
(10) GB 1769 89 (79) "Determination of Polishing Properties of Paint Films";
(11) GB 6742-86 "Paint Film Bending Test (Cylindrical Shaft)";
(12) GB 1865- -89 (80) "Determination of Paint Film Aging (Artificial Acceleration)";
(13) GB/T1771- -91 "Determination of Paint Film Resistance to Neutral Salt Spray".
