Blackening treatment process for surface of ironwork

Abstract

The invention discloses a blackening treatment process for the surface of ironwork. The blackening treatment process comprises the following steps that firstly, a nitriding furnace is warmed to 620-650 DEG C; secondly, the surface of the ironwork is cleaned; thirdly, the cleaned ironwork is placed in the nitriding furnace; fourthly, 900 ml of alcoholic solution is dropped in the nitriding furnace; fifthly, constant temperature is kept for 120 min; sixthly, the nitriding furnace stops heating, and natural cooling is carried out; and seventhly, the ironwork is taken out of the nitriding furnace and cooled to normal temperature. The steps of the blackening treatment process are reasonable, strong-acid-free ironwork surface blackening treatment is achieved through the steps, cost is low, and operation safety is high.

Description

technical field [0001] The invention relates to a metal surface treatment process, in particular to a blackening treatment process capable of forming an outer protective layer on the surface of iron products and realizing the antirust of iron products. Background technique [0002] Iron blackening treatment (also known as bluing treatment) is a common antirust treatment process for metal products. Its purpose is to form a dense and smooth ferric oxide film on the outer surface of iron products. The existing iron blackening treatment process has two kinds of high temperature blackening and normal temperature blackening, the biggest difference between the two is whether to heat during the blackening process. Normal temperature blackening process, and has a certain anti-corrosion and anti-rust effect. Iron high-temperature blackening process, its effect and functional quality are far more than normal temperature blackening, but the existing iron high-temperature blackening pr...

AI Technical Summary

Problems solved by technology

Iron high-temperature blackening process, its effect and functional quality are far more than normal temperature blackening, but the existing iron high-temperature blackening process mainly includes: decontamination, pickling, oxidation treatment, saponification, hot water boiling, inspection and other steps, in the above treatment, strong acids such as hydrochloric acid and sulfuric acid need to be used, and a large amount of pungent odor will be generated during use, which will have a certain impact on the air environment

In addition, strong acids such as hydrochloric acid and sulfuric acid have certain safety hazards in the process of transportation, storage and use.