Papers by Keyword: Splash Zone

Abstract: This study indicated the deterioration of the steel pipe and beam structure in west coast Sumatra made of ASTM A252, and also pipeline along Riau land-Jambi - Batam Island. It was found that severest corrosion occurs at the rate up to 1.6 mm/year (63 mpy) on the steel cross beam-800 on west coast Sumatra. Whereas the corrosion rates on ASTM A234 and API 5L steel structures along the pipeline across Riau - Jambi - Batam occur from the high-to-severe up to 0.43 mm/year (17 mpy) mainly on pipe elbow 16” diameter. Due to this corrosion attack, the steel infrastructure requires whole protection including sacrificial thickness, surface coating, and cathodic protection. The corrosion attack data may be used to provide the required effort and its priority to protect the steel pile and pipe infrastructures on Sumatra Island.

Abstract: Corrosion of reinforced concrete structure in the marine environment is easily happened because of the influence of chloride ion, and the corrosion in the splash zone is the most serious. Cathode protection is the most common and effective way in anticorrosion method. For simple steel structure, anticorrosion technology has been basically mature^[1].But for some complex marine engineering structures, many key technologies have not been resolved, which constraints the design and construction of such facilities. In this paper, combined the experiments and the research of the model piles of the coal wharf of Rizhao Port, the sacrificial anode protection technology has been introduced and some problems have been solved, such as the relevant operation technologies, parameter design, material selection and so on.

Abstract: Different zones of the marine environment were simulated by a designed marine corrosion test device in laboratory, through which the corrosion rate was tested by weight loss method applying separate specimens and electrically connected specimens, separately, and the test data were compared with those by seawater exposure method. The results showed that the corrosion in splash zone was the most severe whether for separate specimens or electrically connected specimens, and for the latter, the experimental data were more reasonable to simulate a continuous marine structure throughout the different zones in marine environment. The feasibility and reliability of the simulation device and the experiment method were also verified.

Abstract: The most severe corrosion of offshore steel structure occurs in splash zone. There are many factors affecting the steel structure corrosion in the splash zone, such as corrosion problems caused by seawater and effect of impacted brought by the ocean wave. Considering the corrosion characteristics in splash zone and the corrosion invalidity behaviors of offshore steel structure, the Zn-15Al, Al-RE, Zn-Al-Mg-RE and FeBSiNb uncrystal coatings were prepared by automatic high velocity arc spraying. The different anti-corrosion behaviors of the four coatings were studied through the corrosion comparative tests and the microstructures analyzed of the coatings before and after the corrosion tests. The anti-corrosion coating systems suitable for using on surface of steel structure corrosion in the splash zone were found, which provided technique guarantee for extending the using life of offshore steel structures.