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Strong-acid-erosion-resistant high-entropy alloy coating for repairing stirring paddle blade of phosphoric acid reaction tank and preparation method of high-entropy alloy coating

A phosphoric acid reaction tank and high-entropy alloy technology, applied in the field of alloys, can solve problems such as variable structure and complex components of high-entropy alloys

Pending Publication Date: 2022-07-29
GUIZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the composition of high-entropy alloys is complex and the structure is changeable, so it is necessary to carry out precise composition design under the guidance of theory.

Method used

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  • Strong-acid-erosion-resistant high-entropy alloy coating for repairing stirring paddle blade of phosphoric acid reaction tank and preparation method of high-entropy alloy coating
  • Strong-acid-erosion-resistant high-entropy alloy coating for repairing stirring paddle blade of phosphoric acid reaction tank and preparation method of high-entropy alloy coating
  • Strong-acid-erosion-resistant high-entropy alloy coating for repairing stirring paddle blade of phosphoric acid reaction tank and preparation method of high-entropy alloy coating

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Embodiment 1

[0034] (1) Composition design: according to 904L stainless steel grade (00Cr 20 Ni 25 Mo 4.5 Cu), converted into the corresponding atomic ratio: Fe-24.2Ni-22.9Cr-2.6Mo-1.5Mn-1.3Cu, according to the cluster plus connecting atom model, its cluster formula can be described as [Cr-Fe 7.6 Ni 3.9 Mn 0.3 Cu 0.2 ]Cr 2.6 Mo 0.4 . Without considering Mn and Cu, the concept of "average atom" is introduced, and the group VIII Fe, Co, and Ni with similar atomic properties and weak interaction force are regarded as the average atom M, and M is selected as the solvent atom to replace Fe and Ni at the atomic positions of the shell, the cluster model we constructed from this is [Cr-Fe 4 Co 4 Ni 4 ]Cr 2.6 Mo 0.4 (Co 25 Cr 22.5 Fe 25 Ni 25 Mo 2.5 , at.%). On this basis, we plan to add Al atoms at the connecting atom positions to further construct the ordered phase coherent precipitation of [Cr-Fe 4 Co 4 Ni 4 ]Cr 2.6-x Al x Mo 0.4 A high-entropy alloy system is used to imp...

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Abstract

The invention discloses a strong-acid-erosion-resistant high-entropy alloy coating for repairing a stirring paddle blade of a phosphoric acid reaction tank, which is characterized in that Fe, Co and Ni are adopted as solvent atoms to replace Fe and Ni at the atomic position of a shell layer on the basis of 904L stainless steel with the trademark of 00Cr20Ni25Mo4. 5Cu, so that a cluster model formula [Cr-Fe4Co4Ni4] Cr2.6Mo0.4 is constructed, Al is added at the atomic connecting position to obtain an ordered-phase coherent high-entropy alloy formula [Cr-Fe4Co4Ni4] Cr2.6-xAlxMo0.4, and x is equal to 0-1. According to the method, a cluster and connecting atom model design theory is introduced, chemical components of 904 stainless steel are analyzed, cluster type [Cr-Fe4Co4Ni4] Cr2.6Mo0.4 high-entropy alloy components similar to the chemical components of the 904 stainless steel are constructed, Al atoms are added to the connecting atom positions, the [Cr-Fe4Co4Ni4] Cr2.6-xAlxMo0.4 high-entropy alloy subjected to ordered phase coherent precipitation is further constructed, and the high-entropy alloy coating is prepared through a broadband laser cladding technology. The hardness and the erosion corrosion resistance of the alloy are improved.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to a high-entropy alloy coating for repairing a stirring blade of a phosphoric acid reaction tank with resistance to strong acid erosion and a preparation method thereof. Background technique [0002] my country is a big producer of phosphorus chemical products, and the output of phosphorus chemical products is abundant. During the production of phosphoric acid by phosphorus chemical enterprises, the impeller blades collide strongly with the phosphate rock, which is prone to erosion and corrosion. 904L stainless steel stirring blades are widely used in the preparation of phosphorus chemical products, but their hardness is low, and the erosion resistance of ore particles in strong acid environment is not enough. The annual repair cost is over 100 million yuan. It is urgent to find suitable erosion and corrosion resistant surface coating alloys . [0003] High-entropy alloys were firs...

Claims

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Application Information

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IPC IPC(8): C22C30/02C22C1/04C23C24/10
CPCC22C30/02C22C1/04C23C24/106
Inventor 刘其斌尚晓娟郭亚雄薄盛宏
Owner GUIZHOU UNIV
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