Test panels for fluidized bed dip coating
(1) The material and size of the test sample substrate of the fluidized bed dip coating method (GB6554-86) are specified as follows:
A, type cold-rolled steel plate, the size is 1mm150mmx200mm.
A2 type cold-rolled steel plate, the size is 1mmX7l11mmX100mm.
Type B steel block, the size is 10mmX100mmX150rnm, ground into a square without sharp edges, and the size is accurate to 0.025mm. The steel should meet the requirements of GB700-79 "Technical Conditions for Ordinary Carbon Structural Steel".
The test quantity and coating thickness of some test items are specified in Table 6-2, and can also be prepared according to the requirements of the United States. Items with special requirements for samples will be explained separately in this item.
Before coating, the substrate should be degreased and cleaned with a suitable solvent, and the surface should be smooth and free of rust.
A fluidized bed coating process is recommended for specimen preparation.
Test sample of electrostatic spraying method
(2) The test sample of electrostatic spraying method (HG/T2006-9l, HG/T 2597-94) Use the steel plate specified in GB/T1728, and carry out phosphating process after derusting and degreasing. Except for steel plates for acid resistance, alkali resistance, salt spray resistance, heat and humidity resistance, adhesion and cupping test (recommended instrument: cupping Tester) , tinplate plates are used for other tests.
The preparation of the coating film is first to put the blank sample in the powder spraying cabinet, spray with Spray Guns, high-voltage electrostatic generators, powder spraying cabinets, powder recovery devices, Air Compressors and other equipment, and then keep the sprayed samples in good condition. Put it vertically into a blasting constant temperature Drying Oven for curing (according to the specified temperature and time, and the thickness of the coating film is also controlled according to the specified requirements), and finally place it in the constant temperature room for 24 hours, and perform performance tests according to relevant methods.
