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Precoating agent for metal surface

A technology of metal surface and pre-filming agent, which is applied in the direction of metal material coating process, etc., can solve the problems of passivation waste liquid environmental pollution, large consumption of passivating agent, slow corrosion speed, etc., and achieve good effect and short pre-filming time Short, cost-saving effect

Inactive Publication Date: 2006-01-04
SHANGHAI WANSEN WATER TREATMENT CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0002] For central air-conditioning systems or large-scale industrial cooling water systems, the water volume is large. If such systems are cleaned and then passivated, the consumption of passivators will be large and the cost will be high. bring pollution
Moreover, this type of system is often treated with dosing during daily operation, and the corrosion rate is relatively slow.

Method used

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Embodiment Construction

[0017] A kind of metal surface prefilming agent of the present invention is characterized in that, contains sodium hexametaphosphate, zinc sulfate and water, and each component is as follows by weight percentage:

[0018] Sodium hexametaphosphate: 60% to 80%;

[0019] Zinc sulfate: 15% to 20%;

[0020] The balance is water

[0021] The using method of the present invention is as follows:

[0022] 1. After acid cleaning and passivation of the circulation system, the passivation solution is discharged and rinsed in a circular manner until the water quality is clear.

[0023] 2. Add the metal surface pre-film agent of the present invention and circulate for 2 hours to ensure uniform concentration of the entire system.

[0024] 3. Turn on the circulation pump for at least 2 hours a day, and switch to the daily operation state after one week.

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Abstract

The present invention belongs to the field of chemical technology, and discloses one kind of pre-coating agent for metal surface. The pre-coating agent for metal surface includes sodium hexametaphosphate, zinc sulfate and water. The pre-coating agent for metal surface is suitable for use in heat exchanger of medium carbon steel, stainless steel, etc. of central air conditioning system and industrial cooling water system and oil pipeline. The present invention also provides the usage of the pre-coating agent for metal surface. The present invention is one kind of concentrated pre-coating agent and has short pre-coating time, high effect, and easy storage.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a treatment agent used after metal surface cleaning, more specifically, the invention relates to a pre-film agent for metal surface. Background technique [0002] For central air-conditioning systems or large-scale industrial cooling water systems, the water volume is relatively large. If such systems are subjected to passivation treatment after cleaning, the consumption of passivation agents will be large and the cost will be high. Bring pollution. Moreover, this type of system is often treated with dosing during daily operation, and the corrosion rate is relatively slow. Therefore, if this type of system is not sealed after cleaning, it can be directly put into daily operation after pre-film treatment without passivation. [0003] The purpose of the pre-film is to pre-form a complete and durable layer on the fresh metal surface in an activated state after cleaning, especially af...

Claims

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Application Information

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IPC IPC(8): C23C22/12
Inventor 沈志昌
Owner SHANGHAI WANSEN WATER TREATMENT CO LTD
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