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New salt bath sulfurizing process

A new process, sulphurizing technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc.

Inactive Publication Date: 2013-05-29
DALIAN SHENGJIE VACUUM TECH DEV
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Problems solved by technology

[0002] During the low-temperature electrolytic sulfurizing process in the salt bath, a large amount of insoluble matter is continuously produced, which makes the salt bath age, and some of the slag is magnetic and some is non-magnetic, which will cause Phenomenon of mucous membranes in stretching dies

Method used

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Embodiment 1

[0013] A new salt bath vulcanization process can completely avoid the phenomenon of sticking film in the drawing die. A new salt bath sulfurizing process is characterized in that the sulfurizing temperature is 180-190°C and the time is 6-8 hours. The salt bath sulfurizing formula includes 99% by weight of industrial sulfur, 1% of iodine and 0.2% of iron powder. The process includes pretreatment and final low temperature salt bath sulfurization treatment. Pretreatment includes: washing in gasoline, degreasing and boiling for 10-30 minutes, then washing with cold water, surface activation and rust removal at 25°C for 30 seconds, and then washing with cold water to remove the activator. The degreasing formula is NaOH 100g / L, NaOH 2 CO 3 30g / L, Na 2 PO 4 12H 2 O is 30g / L, and the rest is water. The formulation of the activator is HNO by volume 3 15%, HCL 15%, H 2 SO 4 2%~3% and water.

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Abstract

The invention provides a new salt bath sulfurizing process which can completely prevent a stretching mold from a mold sticking phenomenon. The new salt bath sulfurizing process is characterized in that the sulfurizing temperature is 180-190 DEG C and the time is 6-8 hours. A salt bath sulfurizing formula of the process comprises the following components in percentage by weight: 99% of industrial sulfur, 1% of iodine and 0.2% of iron powder. The process comprises pretreatment and final low-temperature salt bath sulfurizing treatment. The new salt bath sulfurizing process ensures that the salt bath lasts for long without being aged and is in a high-activity state, can completely prevent a stretching mold from a mold sticking phenomenon, and improves the seizure resistance of friction parts.

Description

technical field [0001] The invention relates to a low-temperature sulfurizing treatment of a quenched and tempered steel workpiece or mold by using a crucible-type salt-bath furnace, in particular to a new salt-bath sulfurizing process. Background technique [0002] A large amount of insoluble matter is continuously produced in the process of low-temperature electrolytic sulfurization in the salt bath, which makes the salt bath age. Part of the slag is magnetic and part is non-magnetic, which will cause the phenomenon of sticking film in the drawing die. Contents of the invention [0003] The invention provides a new process of salt bath vulcanization, which can completely avoid the phenomenon of mucous film in the stretching die. [0004] A new salt bath sulfurizing process is characterized in that the sulfurizing temperature is 180-190°C and the time is 6-8 hours. [0005] The salt bath sulphurization formulation of the process includes 99% by weight of industrial sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/42
Inventor 田绍洁崔美英
Owner DALIAN SHENGJIE VACUUM TECH DEV
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