Steel structure pipeline anti-corrosion paint use points
Yan Darong (Jinling Special Coatings Factory, Yangzhou 225212, Jiangsu Province) removes rust from ordinary steel by sandblasting to remove rust, oxide and other debris. The surface treatment quality control shall meet the Sa2.5 grade specified in GB8923 “Standard grade and rust removal grade of steel surface before paintingâ€, the surface roughness shall be 35~7501, and the dust shall be removed after sand blasting. The steel after blasting should finish the first lacquer within 4 hours. If ET-98 inorganic phosphate long-acting zinc-rich coating H is used to remove oil and rust, it can be blasted or shot blasted, but it can be treated with wire brush, sander or grit paper. . (4) For the galvanized layer, the ash layer, oil stain and other impurities must be removed by light sweeping sandblasting, and then 70-H epoxy iron red anticorrosive paint is applied. The coating environment has a great influence on the quality of the paint film. In order to ensure the quality of the paint, the following requirements are imposed on the painting environment: the open-air painting operation cannot be carried out in the sun and in the rain, fog and snow; the relative humidity is greater than It is not suitable for construction at 85%; the substrate temperature must be higher than the dew point above 3 * C for construction. ET-98 inorganic phosphate long-acting zinc-rich coating is fine. Construction is not allowed in summer and when the substrate temperature is greater than 60*C. When the winter temperature is not lower than a 5*C, 70-H epoxy iron red anticorrosive paint, H06-3 epoxy cloud iron antirust paint, and ZHL51-2 ultra thick pulp epoxy asphalt antirust paint should not be used for outdoor construction. First check if the type and name of the paint meet the requirements for use. After the paint is opened, it should be thoroughly stirred to make the precipitate evenly mixed. Two-component paint must be blended on site according to the ratio, engineering dosage and permitted construction time specified in the specification. H06-1 epoxy zinc-rich anti-rust primer blending. The mixing ratio of A and B is component A: component B = 4:1 (weight ratio). Add component B to the vat of component A, stir well, and let it stand for 20 minutes before use. H06-3 epoxy cloud iron antirust paint. The mixing ratio of A and B is component A: component B = 4: (weight ratio), the component B (curing agent) in the small bucket is added into the large barrel of the component A, stirred evenly, and placed for 20 minutes before being matured. The preparation of the thick paste type epoxy asphalt anticorrosive paint can be carried out in the same manner. Chlorinated rubber topcoat. The chlorinated rubber topcoat is a single-pack coating, which can be used evenly after being opened. Airless high pressure spraying methods can be used, or manual or air spray construction methods can be used. In order to ensure the thickness of the paint film in the welding, corners, corners, etc., before the large-area coating, the paint should be pre-coated. When painting, the operator should always measure the wet film thickness with a wet film thickness gauge. When painting, it should be used first and last, left and right, or vertical and horizontal painting methods of left and right and up and down, so that the paint film is smooth and even, and the thickness is uniform. The surface treatment quality is checked according to the color photograph in GB8923-88 national standard. Check the surface condition of the paint film with the naked eye. The paint film should be free of pinholes, bubbles, cracks, shedding, sag, and leakage. The dry film thickness is measured by a paint film thickness gauge. The thickness of the paint film should be determined after each application. The total thickness of the paint film must be determined after the coating is completed. For every 1~3m2, one point (or separately specified), the film thickness of more than 90% of the measuring points must reach the specified value, and the film thickness value that does not reach the specified value is not less than 90% of the specified value. Otherwise, it should be applied or Add one coat. Steel structure and pipeline temperature-resistant parts anti-corrosion and temperature-resistant steel structure and pipeline temperature-resistant parts anti-corrosion, should use the corresponding high temperature anti-corrosion primer, topcoat and silicone modified and inorganic modified high temperature coating. Before the brushing, the steel surface needs to be sandblasted, shot blasted, degreased and derusted before painting, and the bottom and topcoat can be painted. In the case of unconditional sandblasting and shot blasting, the 88-1 degreasing and phosphating treatment agent can be used first, and after 24 hours, the WEH high temperature resistant primer can be applied after wiping with a dry cloth. The best solution is that after the steel surface is treated like normal paint, it is coated with ET-98 inorganic phosphate long-acting zinc-rich paint, which can withstand high temperatures of 200 ~ 600 °C, and then be coated with temperature-resistant WEH200 * C high temperature resistant surface. Two paints, high temperature resistant paint can be used on both sides of the bottom, and the dry film thickness can be about 80~9Fm. Note: The recommended supporting solutions are detailed in the technical documents provided by the manufacturer. For technical confidentiality considerations, they are not disclosed here. [〕] Da Darong, chairman and general manager of Sino-US joint venture Yangzhou Jinling Special Coatings Co., Ltd. It is currently the editorial board member and special author of this journal. Contact number or 0514*(2(1)1-02-04Editor Wang Dexiang) Nut setter,hex nut setter,magnetic hex nut setter,nut setter factory henan horn tools co.,ltd. , https://www.hornhandtools.com