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Slurry Erosion-Corrosion of Scoop Teeth of Suction Dredgers

Lou Hongqing Sui Runzhou Lu Sheng (Dept.of Welding and Material Eng.,East China Shipbuilding Institute,Zhenjiang,Jiangsu, 212003) Ma Yuying Chen Guangying (Shanghai Jiuzhou Dredging Engineering Corporation,Shanghai, 201208)  
Slurry erosion corrosion has been observed under practical conditions on the alloy steel teeth of a scoop type suction dredger.The tooth surfaces were attacked by the slurry containing sand,silt and water with a high chloride content.Pits with tail like grooves and oxide films with a network of cracks were observed by macroscopic and microscopic surface examination.A model is proposed for analysing the synergistic effects of erosion and corrosion and the effects of material factors on slurry erosion-corrosion resistance.The processes of formation of the surface features are described.It is suggested that in the selection of materials for use under conditions similar to those of the scoop teeth,attention should be paid to material hardness,toughness,purity and electrical potential of the material in the aqueous medium.Materials with both high hardness and toughness offer high erosion resistance.Materials with low inclusion levels and high electrical potential in the aqueous medium normally exhibit high corrosion resistance.
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