Tips and precautions for segmented coating of ships

(1) Before coating, the pre-treatment of steel plate strictly meets the relevant standards of secondary rust removal, oil removal, de-fouling, wipe the surface with solvents, and should be painted as soon as possible to avoid steel reoxidation rust.(2) according to different parts of the ship and different requirements for use, choose a reasonable variety of paint and supporting programs. Each coating shall be constructed in accordance with the requirements of the product instruction manual. Pre-coating check all paint varieties, colors, specifications and models meet the technical requirements of coating, check the quality of the coating and storage period, beyond the storage period of the paint must be qualified units to re-test, qualified to use.(3) must be used in accordance with the requirements of thinners, generally not more than 5% of the amount of paint, paint is not allowed to add harmful solvents or pigments, should be evenly adjusted before use, and in accordance with the requirements of the coating method for filtration. Two-part coating, to be proportionally added curing agent, and can be mixed evenly, there must be a certain period of activity and a certain period of time to run out.(4) Construction units can be based on the nature of the coating, the surface status of the coating and environmental conditions to adopt appropriate coating methods, generally for brushing, roller coating, air spraying, airless spraying and scraping and other construction methods. In order to improve efficiency and get a beautiful coating film, high-pressure airless spray is generally used. However, the coating of the narrow compartment is still done with roller or hand brushing. Pre-coated with brushes, elbow brushes, etc. for flowing water holes, angle iron backs, and areas that are not easy to spray. Brush and coat the contact areas of the heterometals and at the rivets, welds and corners before spraying.(5) coating film should reach the specified dry film thickness, in the coating process, continuous measurement of wet film thickness, in order to estimate the spray several to achieve the specified dry film thickness. Before spraying, test spray, select the right nozzle, adjust the appropriate pressure.(6) anti-rust coating, it is best to use the same variety and different colors of paint to prevent leakage and facilitate quality inspection. After the coating is completed, the total dry film thickness should be checked according to the corresponding standards and the coating leak detection test should be carried out.(7) It is prohibited to paint on surfaces that are not suitable for painting, such as sacrificial anodes, insoluble auxiliary anodes, reference electrodes, receivers and transmitter threads, signs, rubber seals, valves, steel cables, active friction surfaces, etc. Cover with tape paper when spraying or other methods of coating.(8) it is strictly prohibited to apply anti-fouling paint and waterline paint directly to exposed metal surfaces or interior walls. " (9) is strictly prohibited when coating in segments. High-pressure airless spraying must strictly follow operating procedures and prevent spray on environmental pollution. Install appropriate ventilation equipment to avoid toxic and possible fires caused by solvent evaporation, while ensuring construction quality. The small compartment must be coated with artificial ventilation, construction personnel should wear gas masks and continuous operation should not exceed half an hour.(10) coating construction is generally selected in the temperature of 5 to 30 degrees C, relative humidity is less than 85% of the environment. Do not apply outdoors when it rains, is foggy or the hull is covered with water vapor and frost. High winds, dust and more should not be coated. The temperature of the steel plate shall be above 3 degrees C above the dew point, and the temperature shall not be lower than the minimum temperature specified for the drying of the coating.(11) aluminum, galvanized surfaces or other special material surfaces should be selected with special coatings, such as zinc yellow primers, do not allow the coating of copper, mercury, lead pigments primers.welds and rivets in the hull part of the ship are not painted within 10mm before the watertew test, and within 50mm of the weld edge before welding. Apply paper or plastic film to cover up when coating, after coating timely removal.(13) In order to ensure the quality of the coating, the coating film should be fully dried before moving in segments. Avoid wearing the coating film when moving.(14) paint construction, the construction unit should be based on the ship's various parts of the coating area, construction methods, substrates and other actual conditions and reference to the previous construction data and other factors, estimate the amount of paint required, and formulate a detailed construction plan.