CS233140B1 - Means for phosphating steel wires in continuous lines - Google Patents

Abstract

The invention relates to a composition for phosphating steel wires based on primary zinc phosphate, free phosphoric acid, zinc and nickel nitrate, organic hydroxy acids or their salts and accelerators of the phosphating process. It solves the treatment of steel wires in continuous lines, where, due to high drawing speeds, extremely short exposure times must be achieved. The invention can be used in the chemical industry.

Description

The present invention provides a process for phosphating steel wires in continuous lines based on primary zinc phosphate, free phosphoric acid, zinc nitrate, nickel nitrate, organic hydroxides or their salts, and phosphatization process accelerators that solve the problem of phosphate layer formation in extremely short exposure exposures. times.

Phosphating is generally used as a treatment of steel wire prior to drawing, which is intended both to form a carrier layer for the lubricant and to prevent the formed metal from coming into direct contact with the die in the event of a local lubricant film failure. The formation of phosphate layers and their effective use further includes the area of optimum surface preparation prior to the actual phosphatization, in most cases with the necessity of surface activation, the area of application of a suitable drawing lubricant and last but not least the area of drawing technology and technological equipment. stationary treatment, on the one hand continuous line arrangement.

Surface treatment of wires by immersion in individual baths, i. The stationary method has certain disadvantages due to the continuous transport of material in operation. Since steel wires are conventionally heat-treated (patented) in continuous furnaces, it is advantageous to perform wire surface treatment also in a continuous continuous line.

The advantage of the continuous wire treatment method is shorter

- 2 233 140 the duration of the individual treatments, i.e. in particular pickling and phosphatization, and further the reduction of the consumption of pre-treatment chemicals.

Wire tensile installations installed in the frame of machine park innovation in metallurgical secondary production achieve wire drawing speeds of 25 - 50 m. For these high speeds, a phosphatizing agent must be used to treat the wire to provide a phosphate layer on the wire surface at extremely short exposure times, i.e. within 10 seconds.

There are a number of foreign and domestic preparations based on the basis for wire phosphating prior to drawing)

phosphoric acid, nitric acid, zinc, nickel, copper, cadmium and other elements such as Bonder 181, Bonder I83, Granodine 43, Granodraw 43, Synfate 1000, Syxifate 1100, Synfate 1130, some of which can also be used for increased scoring continuous treatments, but the minimum exposure time of these preparations is generally 30 to 90 seconds. At these exposure times, the length of the phosphatization zone and the length of the other pretreatment zones at draw speeds above 25 m would be based. sec **** excessively long.

The above-mentioned disadvantages are lessened by the composition according to the invention based on primary zinc phosphate, free phosphoric acid, zinc nitrate, nickel nitrate, organic hydroxic acid or salts thereof and alkali metal nitrate phosphate accelerators, characterized in that it consists of 2 to 6% by weight. . % of primary zinc phosphate, 1 to 3 wt. % free phosphoric acid, 5-12 wt.%, zinc nitrate, 0.1-1.5 wt. % of nickel nitrate, 0.5 to 1.0% by weight; % of alkali metal chlorates, 0.01 to 0.04 wt. 0.02 to 0.15 wt. alkali metal nitrites,

0.01 to 0.1 wt. organic hydroxy hydroxylsols or salts thereof having 1 to 20 carbon atoms per molecule and 76 to 91.5% by weight of water, all based on bath concentration.

The composition according to the invention is suitable for application in

233 140 tinuel lines. It forms a thin fine-grained phosphate layer on the surface of the treated steel wire, which has been previously free of grease, dirt, scale and rust, in less than 10 seconds.

The composition is prepared from individual raw materials in concentrated form and before. Usually, it is diluted with water in a ratio of 1 part concentrate to 10 parts water. The alkali metal nitrite component is dosed separately, just before the start of phosphatization, in the form of an approximately 10% aqueous solution. The composition of the invention is applied at a temperature of 65 to 75 ° C.

The invention is illustrated by the following non-limiting examples.

Example 1

The composition consists of 3.4% by weight. % zinc phosphate, 2.15 wt. free phosphoric acid,

8.74 / i. zinc nitrate, 0.66 wt. nickel nitrate, 0.74 wt. sodium chlorate, 0.02 wt. copper sulfate, 0.04 $ > citric acid, 0.07 wt.%, sodium nitrite and 84.18 wt. water.

Example 2

The composition consists of 4% by weight, primary zinc phosphate, 2.6% by weight. % free phosphoric acid, 6.9% by weight. zinc nitrate, 1.0 ^c fo wt. nickel nitrate,

0.7 / »wt. sodium chlorate, 0.03 wt. copper sulfate, 0.06 wt. % sodium citrate, 0.07 wt. sodium nitrite and 84.7 wt. water.

Claims (3)

A composition for the phosphating of steel wires in continuous lines based on primary zinc phosphate, free phosphoric acid, zinc nitrate, nickel nitrate, organic hydroxic acids or their salts, and alkali metal nitrate phosphatization process, characterized in that it consists of: 2 to 6 wt. primary zinc phosphate; 3 wt. % free phosphoric acid, 5-12 wt. % zinc nitrate, 0.1 to 1.5 wt. % of nickel nitrates, 0.5 to 1 wt. alkali metal chlorates, 0.01 to 0.04 wt. 0.02 to 0.15 wt. % alkali metal nitrites, 0.01 to 0.1 wt. organic hydroxides or their salts having 1 to 20 carbon atoms per molecule and 76 to 91.5% by weight of water, all based on bath concentration.