Development of laser clads with high corrosion resistance for nuclear power industry

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This contribution deals with development of a system consisting of a base material and a composite laser clad with high corrosion resistance. The cladding material for laser overlaying was a powder mixture of inorganic substances based on copper and oxides of silicon, iron, calcium and magnesium. Experiments were carried out with three types of powder mixtures with different copper-inorganic oxides ratios. The disk laser Trumpf TruDisk 8002 with wavelength λ=1030 nm was used for producing three laser clad specimens whose total area was 60×95 mm. The substrate was C45 steel. It was 20 mm in thickness and was ground on both sides. Structures of the composite clads were examined using light microscopy and scanning electron microscopy (SEM). Local chemical analysis of dendrites and interdendritic spaces was carried out using EDX in the SEM. The laser clads were found to possess very fine and unique microstructures. The corrosion resistance of the substrate-composite laser clads systems were assessed by means of an advanced electrochemical method of measuring the corrosion rate, which relied on potentiodynamic corrosion testing involving linear polarization. The corrosion resistance data was compared to results of conventional salt spray corrosion tests.This contribution deals with development of a system consisting of a base material and a composite laser clad with high corrosion resistance. The cladding material for laser overlaying was a powder mixture of inorganic substances based on copper and oxides of silicon, iron, calcium and magnesium. Experiments were carried out with three types of powder mixtures with different copper-inorganic oxides ratios. The disk laser Trumpf TruDisk 8002 with wavelength λ=1030 nm was used for producing three laser clad specimens whose total area was 60×95 mm. The substrate was C45 steel. It was 20 mm in thickness and was ground on both sides. Structures of the composite clads were examined using light microscopy and scanning electron microscopy (SEM). Local chemical analysis of dendrites and interdendritic spaces was carried out using EDX in the SEM. The laser clads were found to possess very fine and unique microstructures. The corrosion resistance of the substrate-composite laser clads systems were assessed by means ...