Coating system for fluiding components from cast iron under degradation by wear, cavitation and corrosion

许多机械零件被机械和腐蚀性载荷损坏，E.Q。泵在工厂建设和近海性能中的应用。耐磨性(E.Q.磨损、冲蚀和气蚀)和腐蚀结合在一起，往往会显著影响这些部件的寿命或效率。电流性能的优化往往导致部件的复杂结构。这就是采用铸件作为制造工艺的原因，也是采用片状石墨铸铁作为材料经济的原因。为了提高部件的耐降解性，使用了昂贵的钢材和特殊的铸造材料。这些材料很难加工，导致制造成本很高。高度发达的堆焊技术有可能通过经济的涂层和使用低成本的基础材料来提高部件的承受载荷的能力。这种涂料的开发是通过实验和经验来进行的。对于确定的载荷组合选择涂层系统，涂层的机械工艺性能与复合磨损、冲蚀、气蚀和腐蚀载荷下的性能之间的关系仍然没有得到充分的研究。该建议的主要目的是开发一种涂层系统，以提高铸铁部件在复合载荷(冲蚀、空蚀、腐蚀)下的抗力。计划采用铜基材料和双相钢作为堆焊(等离子转移弧堆焊)的涂层材料。此外，还应研究焊接涂层和热喷涂层的组合。涂层的发展需要研究堆焊铸铁的基本要求、退化机理对焊层抗力的影响以及焊层与喷涂层组合对载荷的影响。基本的科学成果可以转移到其他铸铁部件的涂层系统，而不局限于这个项目。

Many mechanical parts are damaged by mechanical and corrosive loads, e.q. applications of pumps in plant constructions and off-shore properties. The resistance against wear (e.q. abrasion, erosion, and cavitation) and corrosion influence often in combination significantly the life span or the efficiency of such components.The optimisation of the current properties leads often to complex structures of the components. That is the reason to use casting as manufacturing technique and for reasons of economy as material lamellar graphit cast iron. To improve the resistance of the components against the degradation expensive steels and special cast materials are used. These materials are difficult to machine and lead to high manufacturing costs. High developed surfacing technologies have the potential to improve the capacity of components to withstand the loads through economic coatings and to use low cost base materials. The development of such coatings is carried out by experiments and experiences. For choosing coating systems for a defined loading combination the relation between mechanical-technological properties of the coatings and the properties under combined wear, erosion, cavitation and corrosion loading is still not sufficiently investigated.Primary aim of this proposal is the development of a coating system that improves the resistance of components of cast iron against the combined load (erosion, cavitation, corrosion). As coating materials for surfacing (plasma transferred arc surfacing) copper based materials and duplex steel are planned. A combination of welded coatings with thermal sprayed coatings shall be investigated in addition. The development of the coating needs investigation of the basic demands of surfacing cast iron and the influence of the mechanism of the degradation to the resistance of the welded coatings and the combination of welded and sprayed coating against the loads. The basic scientific findings can be transferred to other coating systems of cast iron components and are not limited to this project.