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Method for preparing nitrogen-doped MnCr2O4 coating on surface of FeCrNi alloy

A technology of nitrogen doping and alloying, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of limited anti-coking carburization performance and low content, so as to improve anti-coking carburization performance, The effect of suppressing catalytic coking

Active Publication Date: 2020-09-22
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aforementioned studies proved that MnCr 2 o 4 The coating has good anti-coking carburization performance, but the existing preparation contains MnCr 2 o 4 Most of the anti-coking carburizing coating technologies use the low oxygen partial pressure method to oxidize the Mn and Cr elements in the FeCrNi alloy itself to form MnCr 2 o 4 Coating, limited by the content of Mn element in the alloy, MnCr in the coating 2 o 4 The content is not high, and the anti-coking carburization performance is limited

Method used

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  • Method for preparing nitrogen-doped MnCr2O4 coating on surface of FeCrNi alloy
  • Method for preparing nitrogen-doped MnCr2O4 coating on surface of FeCrNi alloy
  • Method for preparing nitrogen-doped MnCr2O4 coating on surface of FeCrNi alloy

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Embodiment 1

[0038] (1) Manganese sulfate, chromium chloride, ammonium sulfate, ammonium citrate, sodium lauryl sulfate, sodium oxalate and formic acid are dissolved in distilled water to form a plating solution. The concentration of each component in the plating solution is: manganese sulfate 100g / L, chromium chloride 150g / L, ammonium sulfate 100g / L, ammonium citrate 25g / L, sodium lauryl sulfate 0.8g / L, sodium oxalate 20g / L, formic acid 20g / L;

[0039] (2) FeCrNi alloy is used as the substrate, and the metal coating is formed by pulse electrodeposition in the plating solution (the coating consists of metal Mn, metal Cr and a small amount of MnCr alloy). The specific electrodeposition process is as follows: use platinum electrode as anode, FeCrNi alloy as cathode, use dilute sulfuric acid and dilute sodium hydroxide solution to adjust the pH value of the plating solution to 3.5, the temperature of the plating solution is 25°C, and use electromagnetic stirring during the electroplating proce...

Embodiment 2

[0045] (1) Manganese sulfate, chromium chloride, ammonium sulfate, ammonium citrate, sodium lauryl sulfate, sodium oxalate and formic acid are dissolved in distilled water to form a plating solution. The concentration of each component in the plating solution is: manganese sulfate 100g / L, chromium chloride 150g / L, ammonium sulfate 100g / L, ammonium citrate 25g / L, sodium lauryl sulfate 0.8g / L, sodium oxalate 20g / L, formic acid 20g / L;

[0046] (2) FeCrNi alloy is used as the substrate, and the metal coating is formed by pulse electrodeposition in the plating solution (the coating consists of metal Mn, metal Cr and a small amount of MnCr alloy). The specific electrodeposition process is as follows: use platinum electrode as anode, FeCrNi alloy as cathode, use dilute sulfuric acid and dilute sodium hydroxide solution to adjust the pH value of the plating solution to 3.5, the temperature of the plating solution is 25°C, and use electromagnetic stirring during the electroplating proce...

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Abstract

The invention discloses a method for preparing a nitrogen-doped MnCr2O4 coating on the surface of a FeCrNi alloy. The method specifically comprises the following steps: (1) dissolving manganese sulfate, chromium chloride, ammonium sulfate, ammonium citrate, lauryl sodium sulfate, sodium oxalate and formic acid in distilled water to prepare a plating solution, wherein the concentration of each component in the plating solution is as follows: 100-300 g / L of manganese sulfate, 100-300 g / L of chromium chloride, 50-150 g / L of ammonium sulfate, 20-40 g / L of ammonium citrate, 0.5-2.0 g / L of lauryl sodium sulfate, 20-40 g / L of sodium oxalate, and 10-50 g / L of formic acid; (2) adopting the FeCrNi alloy as a base material, wherein in the plating solution, a platinum electrode is adopted as an anode,the FeCrNi alloy is adopted as a cathode, and a metal coating is formed on the FeCrNi alloy through pulse electroplating deposition; and (3) carrying out synchronous nitric oxide treatment on the FeCrNi alloy with the metal coating, namely preparing the nitrogen-doped MnCr2O4 coating on the surface of the FeCrNi alloy. The method is simple in process and controllable in reaction condition, and the nitrogen-doped MnCr2O4 coating prepared on the surface of the FeCrNi alloy has good coking and carburizing resistance.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, in particular to a method for preparing nitrogen-doped MnCr on the surface of FeCrNi alloy. 2 o 4 Coating method. Background technique [0002] FeCrNi alloy is widely used as cracking furnace tube material in ethylene cracking process due to its good high temperature performance, but due to long-term high temperature and containing H 2 、H 2 O, CO, CO 2 、H 2 Serving in complex atmospheres such as S and hydrocarbons, the alloy is prone to corrosion in the form of sulfidation, carburization, coking, decarburization, and hydrogen corrosion. Among the various damages of the furnace tube, the coking and carburizing of the furnace tube is the most common and the most harmful. [0003] In order to improve the anti-coking and carburizing performance of FeCrNi alloy, domestic and foreign scholars have carried out a lot of research, among which the surface treatment technology of furnace tube ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D5/18C25D5/48C23C8/28
CPCC23C8/28C25D3/56C25D5/18C25D5/48
Inventor 杨瑞嵩李明田附青山崔学军
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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