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

许多机械部件因机械和腐蚀性载荷而损坏，例如：泵在工厂建设和海上物业中的应用。耐磨性（例如，磨损、侵蚀和气蚀）和腐蚀通常共同显著影响这些部件的寿命或效率。电流性能的优化通常导致部件的复杂结构。这就是为什么采用铸造作为制造技术和出于经济原因作为材料的片状石墨铸铁。为了提高部件对降解的抵抗力，使用了昂贵的钢和特殊的铸造材料。这些材料难以加工，导致高制造成本。高度发达的表面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承受载荷的能力。这种涂层的开发是通过实验和经验进行的。为确定载荷组合选择涂层系统，涂层的机械-技术性能与磨损、冲蚀、气蚀和腐蚀载荷组合下的性能之间的关系尚未得到充分研究。本建议的主要目的是开发一种涂层系统，以提高铸铁部件对复合载荷（冲蚀、气蚀和腐蚀）的抵抗力。作为用于堆焊（等离子转移弧堆焊）的涂层材料，计划使用铜基材料和双相钢。此外，还应研究焊接涂层与热喷涂涂层的组合。该涂层的发展需要研究堆焊铸铁的基本要求，研究堆焊层的劣化机理对堆焊层和焊喷结合层抗载荷能力的影响。基本的科学发现可以转移到铸铁部件的其他涂层系统中，而不限于本项目。

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.