Environmental-friendly steel surface cleaning agent capable of derusting and descaling

Abstract

The invention discloses an environmental-friendly steel surface cleaning agent capable of derusting and descaling. The environmental-friendly steel surface cleaning agent is prepared from the components in percentage by mass: 10 to 50 percent of phosphoric acid, 1 to 30 percent of hydroxyethylidene, 1 to 10 percent of tartaric acid, 0.1 to 2 percent of ethylenediamine tetraacetic acid tetrasodium,0.1 to 2 percent of sodium thiosulfate, 0.1 to 2 percent of hexamine, 0.1 to 2 percent of coconut oil alkyl dihydroxy methyl alquat ethoxylated compound, 0.1 to 2 percent of additive, and the balancewater.

Description

technical field [0001] The invention relates to a steel surface cleaning agent, in particular to an environment-friendly steel surface cleaning agent that can remove rust and scale. Background technique [0002] When steel is heated, when iron and oxygen or iron and fuel are burned, the product CO 2 And the chemical action of vaporized water, etc., to form an oxide layer, called oxide scale. Three layers are distributed on the surface of the heated billet; the innermost layer is composed of FeO with fine particles, accounting for 40% of the full thickness of the oxide layer; the middle layer is composed of FeO with coarse particles 3 O 4 composition, accounting for about 50% of its thickness; the outermost layer is composed of Fe 2 O 3 composition, accounting for about 10%. The production of oxide scale, in addition to causing a large loss of steel, will also cause many adverse consequences, mainly including: (1) The oxide scale makes the surface of the forging rough. ...

AI Technical Summary

Problems solved by technology

The generation of oxide skin, in addition to causing a large loss of steel, will also cause many adverse consequences, mainly as follows: (1) oxide skin makes the surface of forgings rough

During forging, if the oxide skin is pressed into the forging, it will become a waste product in serious cases; (2) some additional auxiliary processes and equipment need to be added to remove the oxide scale; (2) the oxide scale has higher hardness, which not only increases the The consumption of deformation energy will accelerate the wear of the forging die and reduce the service life; (3) The oxide skin will chemically corrode the refractory bricks, causing premature damage to the bottom of the heating furnace

[0003] In order to remove scale, hydrochloric acid, sulfuric acid, hydrofluoric acid, etc. have been used as cleaning agents in the past, but these cleaning agents are still weak and slow in removing scale, which cannot meet the needs of production applications

The existing products also have the following technical defects: (1) the formula of the prior art products contains some hydrochloric acid or hydrofluoric acid, so there is still acid mist in production and application

(2) The application concentration of the prior art products is high, and usually requires a concentration of 40% or even the use of the stock solution. The cleaning and peeling speed can only meet the production needs when the temperature is at 60 ° C or above, and the cleaning of the scale is almost ineffective at room temperature. , resulting in high production costs and high energy consumption

(3) There is no anti-rust function, and it will rust immediately after being exposed to the air after cleaning