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Cast iron cookware and method for treating surface of same

A technology for surface treatment and cast iron, which is used in the field of surface treatment of cast iron cookware and cast iron cookware, can solve the problems of shortened service life, rust-prone surface, and oxide scale, and achieves the solution of easy rust, improved physical properties, and improved physical properties. The effect of stability

Inactive Publication Date: 2018-08-24
XINGTAI SANXIA CAST IRON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cast iron cookware is prone to rust when air and water are present at the same time, making the surface scaled, which seriously affects the appearance and service life
[0003] At present, those skilled in the art usually have to treat the surface of cast iron cookware. The common method is to spray vegetable oil on the surface of cast iron cookware. However, the coating of such spray-coated cast iron products is relatively thin, and it is easy to rust when exposed to water for a short time. The service life of the product is greatly shortened, and the appearance quality is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Degrease and derust the surface of the cast iron cookware, so that the surface roughness of the cast iron is 1.6 μm; then put the cast iron cookware in a well-type heat treatment furnace for nitrocarburizing treatment; the temperature of nitrocarburizing is 530°C, and the time is 6h ;The infiltration agent used in nitrocarburizing includes 73wt% ammonia, 22wt% nitrogen, and 5wt% carbon-containing gas; the carburizing atmosphere is: active nitrogen, active carbon, ammonia, nitrogen, carbon monoxide, carbon dioxide, nitrogen monoxide , nitrogen dioxide, hydrogen and water vapor; make the surface of the cast iron cookware form a layer with a thickness of 13 μm; then cool in the air and then carry out vegetable oil coating process.

Embodiment 2

[0035] Degrease and derust the surface of the cast iron cookware so that the surface roughness of the cast iron is 1.7 μm; then put the cast iron cookware in a box-type heat treatment furnace for nitrocarburizing treatment; the temperature of nitrocarburizing is 680°C, and the time is 5h ;The infiltration agent used in nitrocarburizing includes 65wt% ammonia, 30%wt nitrogen, and 5wt% carbon-containing gas; the carburizing atmosphere is: active nitrogen, active carbon, ammonia, nitrogen, carbon monoxide, carbon dioxide, monoxide Nitrogen, nitrogen dioxide, hydrogen and water vapor; make the surface of the cast iron cookware form a layer with a thickness of 14 μm; then cool in the air and then carry out vegetable oil coating process.

Embodiment 3

[0037] Remove oil stains and rust on the surface of the cast iron cookware, so that the surface roughness of the cast iron is 2.1 μm; then put the cast iron cookware in a vacuum heat treatment furnace for nitrocarburizing treatment; the temperature of nitrocarburizing is 700 ° C, and the time is 6 hours; The nitrocarburizing agent used includes 80wt% ammonia, 15wt% nitrogen, and 5wt% carbon-containing gas; the carburizing atmosphere is: active nitrogen, activated carbon, ammonia, nitrogen, carbon monoxide, carbon dioxide, nitric oxide, Nitrogen dioxide, hydrogen and water vapor; make the surface of cast iron cookware form a permeable layer with a thickness of 16 μm; and then carry out vegetable oil coating process after cooling in the air.

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PUM

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Abstract

The invention discloses cast iron cookware and a method for treating the surface of the same. The method includes: putting the cast iron cookware into thermal treatment equipment for nitrocarburizingtreatment at 500-700 DEG C for 5-7h, wherein a permeating agent adopted during nitrogen-carbon co-doping comprises 65-80wt% of ammonia, 15-30wt% of nitrogen and 4-6wt% of carbon-containing gas, nitrogen-carbon co-doping atmosphere contains activated nitrogen, activated carbon, ammonia, nitrogen, carbon oxide, carbon dioxide, nitrogen oxide, nitrogen dioxide, hydrogen and water vapor, and thicknessof a permeating layer on the surface of the cast iron cookware is 10-20 mum. By performing nitrogen-carbon co-doping treatment on the cast iron cookware, stability of structural organization inside the cast iron cookware is improved, toughness of the cast iron cookware is improved, the cookware is made free of deformation and cracking, and physical performance is further improved.

Description

technical field [0001] The invention relates to a method for surface treatment of cast iron cookware and the cast iron cookware. Background technique [0002] Cookware is closely related to people's life, and cast iron cookware is one of the most common and traditional cookware. However, cast iron cookware is prone to rust when air and water exist at the same time, causing scale on the surface, which seriously affects the appearance and service life. [0003] At present, those skilled in the art usually have to treat the surface of cast iron cookware. The common method is to spray vegetable oil on the surface of cast iron cookware. However, the coating of such spray-coated cast iron products is relatively thin, and it is easy to rust when exposed to water for a short time. The service life of the product is greatly shortened, and the appearance quality is reduced. Contents of the invention [0004] In view of this, the object of the present invention is to provide a meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/32
Inventor 杨志文
Owner XINGTAI SANXIA CAST IRON CO LTD
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