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Surface bluing technique for steel piece

A process and technology for steel parts, applied in the field of bluing technology on the surface of steel parts, can solve the problems of poor bluing effect and unsightly oxide film, and achieve the advantages of enhancing the bluing effect, eliminating repetitive processes and improving work efficiency. Effect

Inactive Publication Date: 2016-07-06
CHONGQING YU NAN POLYTRON TECH
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Problems solved by technology

[0003] At present, the bluing effect of the bluing process on the surface of steel parts is not good, and the formed oxide film is not beautiful enough.

Method used

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Embodiment Construction

[0011] The technical solution disclosed by the invention is a process for bluing the surface of steel parts, which is characterized in that it includes the following steps: 1) Degreasing: remove the oil stains attached to the workpiece, and prepare for pickling, and the degreasing process is carried out in a degreasing tank , the ratio of degreasing solution: sodium hydroxide, 50-60g; sodium carbonate, 70-80g; water 1L, use it in a boiling state, boil and wash the workpiece in degreasing for 20-30min, after the oil stains are removed, wash it in flowing water Rinse in to remove the degreasing solution on the workpiece. Other chemical cleaning agents and solvents can also be used for degreasing;

[0012] 2) Pickling: In order to remove the rust, scale and activated surface on the workpiece, the workpiece should be pickled in 20%-35% industrial hydrochloric acid for more than 30s, and the workpiece after the scale should be pickled to Clean, but the workpiece must not be corrod...

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Abstract

The invention discloses a surface bluing technique for a steel piece. The surface bluing technique is characterized by comprising the following steps that (1) degreasing is conducted; (2) acid pickling is conducted; (3) bluing is conducted; (4) saponification is conducted, and according to saponification, iron in micropores of an iron oxide film generated by bluing of a workpiece is converted into iron stearate and is in a passive state, so that the corrosion resistance is improved; a saponification solution is soapy water with the mass fraction being 2%-3%, the saponification solution is used in a boiled state for 5 min, and water drops should not exist on the saponified workpiece; and (5) oil immersion is conducted, specifically, the saponified workpiece is soaked into hot oil with the temperature being 105-115 DEG C for 1-3 min, the moisture is evaporated, and thus an oil film is formed. By the adoption of the bluing technique, a plurality of repetitive procedures are omitted, the working efficiency is improved, and the bluing effect is improved.

Description

technical field [0001] The invention relates to a process for bluing the surface of a steel piece. Background technique [0002] The process of heating steel or steel parts to an appropriate temperature in air-water vapor or chemicals to form a blue or black oxide film on the surface. Also known as blackening. The oxide film formed on the surface of ferrous metal after "bluening" treatment, the outer layer is mainly ferric oxide, and the inner layer is ferrous oxide. [0003] At present, the bluing effect of the bluing process on the surface of steel parts is not good, and the formed oxide film is not beautiful enough. Contents of the invention [0004] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a steel surface bluing process, which eliminates many repetitive processes, improves work efficiency, and enhances the bluing effect. [0005] In order to achieve the above object, the presen...

Claims

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Application Information

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IPC IPC(8): C23C22/62C23C22/78C23C22/82
Inventor 李富朝
Owner CHONGQING YU NAN POLYTRON TECH
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