中文
Marine hoses play a vital role in offshore operations in the oil and gas industry. CDSR oil suction and discharge hose has been widely used due to its high quality and high cost performance.
However, the marine environment poses severe challenges to hose fittings. Corrosion fatigue is a common failure form of metal materials in the marine environment, which seriously affects the service life and safety performance of marine hose fittings.
What is corrosion fatigue?
Corrosion fatigue refers to the fatigue damage of materials caused by the combined action of corrosive environment and alternating stress. It is different from simple mechanical fatigue. The damage process of corrosion fatigue is more complicated, involving the interaction of electrochemical corrosion and mechanical stress. In marine environments, the presence of seawater, salt spray and conveyed material increases the risk of corrosion fatigue.
Factors affecting corrosion fatigue
Environmental factors: Chloride ions in seawater, salt spray and humidity are the main environmental factors that cause corrosion fatigue, which accelerate the electrochemical corrosion process on the metal surface. The situation will be even worse if the conveyed material also contains corrosive components such as hydrogen sulfide.
Stress factor: Alternating stress is another important factor of corrosion fatigue. The greater the amplitude of the alternating stress, the more serious the stress concentration inside the material. At the same time, the stress cycle frequency will also affect the rate of corrosion fatigue.
Material factors: The material selection and surface treatment process of the fitting directly affect its corrosion fatigue resistance. The hot-dip galvanizing process effectively slows down the occurrence of corrosion fatigue by forming a protective layer.
Design of the end joint of CDSR oil hose
To address the corrosion fatigue issues faced by marine hose joints, the exposed surfaces of the CDSR hose end fittings (including flange face) are protected by hot-dip galvanizing in accordance with EN ISO 1461. Hot-dip galvanizing is a mature metal protection technology that forms a dense zinc coating on the surface of metal parts by immersing them in molten zinc liquid. This coating not only has excellent corrosion resistance, but also provides long-term cathodic protection, effectively resisting the erosion of the joint by seawater, salt spray and conveyed material, thereby significantly extending the service life of the fitting and ensuring its reliability under harsh working conditions, reducing the safety risks and economic losses caused by joint corrosion fatigue failure in offshore operations. In addition, we can also provide a variety of marine anti-corrosion solutions such as two-component epoxy resin anti-corrosion coatings and ultra-high molecular weight protective coatings for customers to choose under different working conditions.
Date: 09 Jul 2025