Painting method of seawater ballast tank

Abstract

The invention discloses a painting method of a seawater ballast tank, which comprises the following steps: a, the surface treatment of a steel plate; b, coating requirements and the selection of coating materials: using epoxy coating materials which pass the qualification test according to the IMO requirements, using a color-contrasted multi-layer coating system, enabling the finish coating to be a light-colored one, and enabling the total dry film thickness of the coating to reach NDFT320 mu m in the 90 / 10 principle; c, painting: painting under the climatic conditions of 5-30 DEG C and relative humidity below 85% when the temperature of the steel plate is 3 DEG C higher than a dew point; and d, inspecting: inspecting the surface of the steel plate before painting, and inspecting the quality and the thickness of the coating in and after the painting process, wherein dust on the surface is controlled to be at dust distribution of level one and particle size of '3', '4' or '5', the soluble salt content is controlled to be below 50mg / m<2>, and the roughness is controlled to be 35-75 mu m. By using the painting method, the coating of the seawater ballast tank is expected to reach the target service life of 15 years so as to meet the requirements of the PSPC standard, thereby enabling an enterprise to be more competitive in the market.

Description

technical field [0001] The invention relates to a coating method of a seawater ballast tank, in particular to a coating method of a seawater ballast tank which can last for 15 years. Background technique [0002] Due to the corrosion of seawater ballast tanks, which seriously threatens the navigation safety and structural safety of ships, the International Maritime Organization (IMO) pays more and more attention to the performance and quality of ballast tank coatings, and promulgated the "Protective Coatings for Ship Ballast Tanks" "Performance Standard" (PSPC), the target service life of the coating is set to 15 years. However, the coatings used by many shipyards for ballast water tanks are usually soft dark coatings such as tar epoxy; Compatibility test between coatings; the general dry film thickness is 250-300μm; the process does not limit the requirements for surface defect treatment, and the actual situation only meets the P1 requirements of the ISO 8501-3 standard lev...

AI Technical Summary

Problems solved by technology

[0002] Due to the corrosion of seawater ballast tanks, which seriously threatens the navigation safety and structural safety of ships, the International Maritime Organization (IMO) pays more and more attention to the performance and quality of ballast tank coatings, and promulgated the "Protective Coatings for Ship Ballast Tanks" "Performance Standard" (PSPC), the target service life of the coating is set to 15 years. However, the coatings used by many shipyards for ballast water tanks are usually soft dark coatings such as tar epoxy; Compatibility test between coatings; the general dry film thickness is 250-300μm; the process does not limit the requirements for surface defect treatment, and the actual situation only meets the P1 requirements of the ISO 8501-3 standard level; large seams and damaged parts The treatment level is St 3, and the amount of damage is about 40% of the total area of ​​the section; the actual coating only has a service life of 3-5 years, which is far below the requirements of the PSPC standard