Programme for anti-corrosion coating of offshore drilling rigs (Zinc Plus System), in which Zinc Plus is applied. This is one of the anti-corrosion coating programmes for offshore drilling platforms. Ordinary platform anti-corrosion coatings, marine drilling platforms used by the organic coating anti-corrosion method, offshore drilling platform coatings, in terms of variety and long-lasting ship coatings have many similarities. Offshore platform coating protection has specific requirements: good adhesion between the coating and steel surface, between the various coatings should also have good adhesion, aging performance should be good, salt spray resistance performance should be good, seawater resistance performance should be good, can form a coating with appropriate elasticity, there should be a satisfactory surface treatment, painting and curing conditions, but also can be used in conjunction with the cathodic protection, and so on. And offshore platform coating area is huge, usually offshore drilling platforms in a number of square metres above, and from the maintenance point of view, the requirement of the coating cycle the longer the good. Painting supporting according to the corrosion part, the offshore drilling platform can be divided into three parts, respectively is the atmosphere area, splash zone and full immersion area. First, the coating protection of the atmospheric area of the marine platform is the atmospheric area of the platform corrosion is not so serious parts, compared to other parts of the maintenance will be more convenient, but compared with the ship and the shore structure is still a lot of tough. The selected paint varieties also adopt high performance. The usual kind of coating supporting situation is, there are such contents, the number of coating, dry film thickness and coating structure, one for the inorganic zinc primer, its dry film thickness is 75μm, the second is the cold curing epoxy intermediate paint, the dry film thickness is 200μm, the third is the acrylic urethane topcoat, the dry film thickness is 60μm. a total of the total situation is 5 / 335μm. also, the splash zone of the platform coating protection aspects, splash zone, the splash zone, the splash zone of the platform is not so serious. The splash zone is one of the most seriously corroded areas of the offshore platform structure, which will experience the alternating effects of the ocean atmosphere and seawater impregnation, the impact of waves and ice, the abrasion of the faced anchor chain and floating objects on the water surface, as well as the collision and friction of the docking time of other auxiliary work vessels. Moreover, the splash zone in the maintenance time, surface treatment to carry out sand blasting and painting, is quite difficult, so the platform splash zone painting design, must consider the convenience of future maintenance and painting, and should be appropriate to the thickness of the steel to increase a certain amount of corrosion margin, but also must use high-performance coatings. The usual coating package is: number of passes coating dry film thickness coating structure 1 inorganic zinc silicate primer 75 μm 4 thick slurry epoxy asphalt coating 500 μm total 5/575 μm, 3. Marine platform fully immersed area of the coating protection, marine platform fully immersed area of the rate of corrosion, than the atmospheric area is more serious, however, than the splash zone is much lighter. Marine platform fully immersed area, the general use of cathodic protection, or the use of paint and cathodic protection of the joint protection mode, and rarely used alone to protect the paint, which is because the current anti-corrosion, anti-fouling coatings, the longest period of time is about 5 - 8 years or so, so it is not possible to become the marine platform of a permanent protective coating. The general painting package (plus sacrificial anode protection) presents such a situation: with the number of channels coating, dry film thickness and coating structure, one for the inorganic zinc primer, dry film thickness is 70μm; the second is chlorinated rubber antirust primer, dry film thickness of 100μm; the third is anti-fouling paint, dry film thickness of 200μm; totaling up to 5, 370μm. ii. zinc plus system for offshore rigs As a huge and complex steel structure in the offshore facility, offshore drilling platforms are expensive. Generally, the platform is required to have a service life of 30 to 50 years and is in a harsh marine environment, and fixed platforms are not able to be docked for repairs like ships. Therefore, preventing corrosion on offshore drilling platforms is an extremely important task for the use and safety of the platform. Nowadays, the common anti-corrosion method for steel structure of offshore drilling platform is to adopt organic coating system, and cathodic protection is generally adopted in the fully immersed area, or the joint protection mode of coating and cathodic protection. Although the organic coating system is cheaper, it cannot provide long-term anti-corrosion effect for the steel structure of offshore drilling platforms, and it will be difficult to carry out maintenance in the future. In order to extend the service life of the offshore drilling rig, a special galvanising system produced by a Belgian company is recommended to the owner and the design institute, namely the zinc plus galvanising system. It has the following advantages: firstly, the zinc plus coating has excellent anti-corrosion performance, the dry film of zinc plus galvanised coating contains more than 96% of pure zinc, and the purity of the zinc powder in this product is as high as more than %, and secondly, according to the certification of the British BNF Material Laboratory, the zinc plus galvanised coating with a thickness of 60mm can protect the steel plate from corrosion for more than 12 years under the harsh marine atmospheric conditions, and at least 20 years under the general suburban atmospheric conditions. Thirdly, the zinc plus galvanised coating not only has cathodic protection as hot-dipped zinc and hot-sprayed zinc (aluminium), but also has the same cathodic protection as hot-dipped zinc and hot-sprayed zinc (aluminium).
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