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Cleaning agent for pretreatment of cold-rolling galvanization

A cleaning agent and defoaming agent technology, applied in the field of cleaning agents, can solve the problems of poor buffering capacity, lowering the quality of cold-rolled galvanized products, and oil stains remaining on cold-rolled steel sheets, etc., and achieve a wide use temperature range and good cleaning Effect, strong cushioning effect

Inactive Publication Date: 2008-10-01
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcomings: one is that the buffering ability of the alkaline compound and the chelating agent in the formula to the pH value is not strong, resulting in a short service life of the cleaning agent, and when the replacement is not timely, it is easy to cause oil stains to remain on the cold-rolled steel plate; Prevent the formation of iron soap, which may easily cause iron soap to remain on cold-rolled steel sheets, reducing the quality of cold-rolled galvanized products
Its disadvantage: because its formula contains silicate, if the cleaning agent is used before cold-rolled galvanizing, silicon will easily remain on the cold-rolled steel plate after cleaning the cold-rolled steel plate, reducing the quality of cold-rolled galvanized products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: get sodium hydroxide 40% by weight percentage; Sodium carbonate 22%; Polysodium phosphate 15%; Gluconate 15%; Composite alkyl phosphate surfactant 7%; Polyether type defoamer 1% . After uniformly mixing these raw materials, it can be prepared with tap water, the concentration is 3%, and the cleaning temperature is 70°C. The cleaning agent prepared according to this weight percentage has excellent defoaming performance, and the residual foam height after 10 minutes is ≤1mm; it has good rust resistance and is non-corrosive; it has no flocs and precipitates in hard water; and the water-insoluble matter is less than 1.0 %; no visible residue after rinsing; surface tension ≤ 35mN / m; immersion or spray cleaning of oiled cold-rolled steel sheets, the cleaning efficiency can reach more than 99%.

Embodiment 2

[0028] Embodiment 2: get sodium hydroxide 30% by weight percentage; Sodium carbonate 29%; Polysodium phosphate 28%; Gluconate 5%; Composite alkyl phosphate surfactant 6%; Polyether type defoamer 2% . After uniformly mixing these raw materials, it can be prepared with tap water, the concentration is 2.5%, and the cleaning temperature is 60°C. The cleaning agent prepared according to this weight percentage has excellent defoaming performance, and the residual foam height after 10 minutes is ≤1mm; it has good rust resistance and is non-corrosive; it has no flocs and precipitates in hard water; and the water-insoluble matter is less than 1.0 %; no visible residue after rinsing; surface tension ≤ 35mN / m; immersion or spray cleaning of oiled cold-rolled steel sheets, the cleaning efficiency can reach more than 99%.

Embodiment 3

[0029] Embodiment 3: get sodium hydroxide 40% by weight percentage; Sodium carbonate 20%; Polymeric sodium phosphate 5%; Gluconate 28%; Composite alkyl phosphate surfactant 1%; Polyether type defoamer 6% After uniformly mixing these raw materials, it can be prepared with tap water, the concentration is 3%, and the cleaning temperature is 65°C. The cleaning agent prepared according to this weight percentage has excellent defoaming performance, and the residual foam height after 10 minutes is ≤1mm; it has good rust resistance and is non-corrosive; it has no flocs and precipitates in hard water; and the water-insoluble matter is less than 1.0 %; no visible residue after rinsing; surface tension ≤ 35mN / m; immersion or spray cleaning of oiled cold-rolled steel sheets, the cleaning efficiency can reach more than 99%.

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Abstract

The invention relates to a cleaning agent for cold rolling galvanizing pretreatment, which comprises the following constituents (by weight percentage): sodium-hydroxide 10-50%, sodium carbonate 10-40%, sodium tripolyphosphate 5-30%, glucoheptonates 5-30%, composite alkyl phosphate ester surface active agent 1-7%, and polyether type defoaming agent 1-7%.

Description

technical field [0001] The invention relates to a cleaning agent, in particular to a cleaning agent used for pre-treatment of cold-rolled galvanizing. Background technique [0002] Degreasing and cleaning is an important part of the pre-treatment of cold-rolled galvanizing. Before galvanizing, cold-rolled steel sheets must undergo a surface cleaning process to remove oil particles and other surface residues on the metal surface. Bringing into the cold-rolled galvanizing process will affect the quality of cold-rolled galvanized products. At present, the main cleaning method of the cold-rolled galvanizing production line is alkaline cleaning at a temperature of 70-80°C. Before the present invention, publication number is that CN1548582A " special cleaning agent for cold-rolled steel plate " discloses a kind of cleaning agent that is liquid state. Its shortcomings: one is that the buffering ability of the alkaline compound and the chelating agent in the formula to the pH valu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/14C23G1/18C23G1/19
Inventor 黄先球卢鹰涂元强石争鸣张万灵刘建容
Owner 武钢集团有限公司
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