WO2017214779A1

WO2017214779A1 - Rust removal cleaning agent and rust removal treatment method for stainless steel workpiece

Info

Publication number: WO2017214779A1
Application number: PCT/CN2016/085508
Authority: WO
Inventors: 王饶玲
Original assignee: 深圳市恒兆智科技有限公司
Priority date: 2016-06-12
Filing date: 2016-06-12
Publication date: 2017-12-21

Abstract

Provided are a rust removal cleaning agent and a rust removal treatment method for a stainless steel workpiece. The rust removal cleaning agent is used for pretreating a stainless steel workpiece surface, and comprises, with a total of 100 parts by weight, the following ingredients in parts by weight: 5.7-11 parts of oxalic acid, 0.1-1 part of thiourea, 3.6-7.2 parts of citric acid, 0.7-1.4 parts of ethanol, 0.1-1 part of nonylphenol polyoxyethylene ether, and the balance of water.

Description

Descaling cleaning agent and stainless steel workpiece derusting treatment method

[0001] The present invention relates to the technical field of metal surface treatment, and in particular to a rust removing cleaning agent and a rust removing treatment method for a stainless steel workpiece.

Background technique

[0002] In order to improve the surface properties or appearance of a product, the surface treatment technology of the workpiece is usually applied. For example, the surface treatment of aluminum and iron alloys goes deep into all walks of life. Moreover, most of the work needs to be pretreated before it can be surface treated, for example, cleaning, decontamination and degreasing, and some stainless steel workpieces need to be rusted.

[0003] Generally, the surface of stainless steel is subjected to high-temperature processing such as welding, cutting, hammering, and abrasion to produce brown oxide (rust), residual oil, rust, etc., and these rust or rust need to be rusted. The agent is removed to make the workpiece silver bright and bright, thus solving the blackening phenomenon of the workpiece processing. In general, rust can be removed by acid, but many acids are more corrosive or have irritating odors, and the use of a separate weak acid is not efficient.

technical problem

[0004] In view of the above, a rust-removing cleaning agent having no corrosion, odor, and rust-removing effect, and a rust-removing treatment method for a stainless steel workpiece are provided.

Problem solution

Technical solution

[0005] A rust cleaning agent for forming a film on a surface of a stainless steel workpiece, comprising 100 parts by weight, including the following parts by weight: 5.7-11 parts of oxalic acid, 0.1-1 part of thiourea, 3.6-7.2 The citric acid, 0.7-1.4 parts of ethanol, 0.1-1 part of nonylphenol ethoxylate, the balance is water.

[0006] Also, a stainless steel workpiece rust removal treatment method, comprising the steps of: preparing a rust cleaning agent as described above; dissolving the rust cleaning agent in water to prepare a cleaning solution, and the quality of the cleaning agent in the cleaning solution The percentage is 20-100%; the stainless steel workpiece is cleaned and derusted with a cleaning solution, after a predetermined daytime treatment

, Wash stainless steel workpiece, dry. Advantageous effects of the invention

Beneficial effect

[0007] The above-mentioned rust cleaning agent has no smoke, no odor, can be operated indoors and outdoors, and has no corrosion to the workpiece. Brush, spray and soak the workpiece. The rust-cleaning agent can quickly remove the brown oxide (rust) generated by welding, cutting, hammering, bumping and other high-temperature processing, processing residual oil, rust, etc., so that the workpiece is bright and bright, thus solving The blackening of the workpiece processing. The treated stainless steel surface is smooth and smooth, has strong stability, and the corrosion resistance is obviously improved, prolonging the service life of the equipment and increasing the added value of the product.

Embodiments of the invention

The invention will be described in detail below with reference to specific embodiments.

[0009] An embodiment of the present invention provides a descaling cleaning agent for surface pretreatment of a stainless steel workpiece, comprising 100 parts by weight, including the following parts by weight: 5.7-11 parts of oxalic acid, 0.1-1 part of thiourea , 3.6-7.2 parts of citric acid, 0.7-1.4 parts of ethanol, 0.1-1 parts of nonylphenol ethoxylate, the balance being water.

[0010] Specifically, the parts by weight of the oxalic acid are preferably 6 to 10 parts by weight. The parts by weight of the thiourea are preferably 0.3-0.

6 copies. The citric acid is preferably 4-6 parts by weight. The parts by weight of the ethanol are preferably from 0.8 to 1.2 parts by weight. The nonylphenol ethoxylate is preferably present in an amount of from 0.3 to 0.6 parts by weight. Specifically, the rust cleaner is diluted to a mass concentration of 20-100%. Of course, if the oil rust is serious, it is recommended to use the stock solution without dilution.

[0011] In the above rust cleaning agent, the balance of each of the distribution ratios is controlled to achieve a better rust removal effect. For example, oxalic acid mainly removes rust, lemon tree stabilizes the pH value of the bath, thiourea has a certain function of purifying the bath, and can prevent the workpiece from being over-etched. Nonylphenol ethoxylate and ethanol can remove the oil on the workpiece.

[0012] The rust cleaning agent of the embodiment is suitable for metal workpieces such as stainless steel, and is widely used in various metal processing industries, and can quickly remove the brown oxidation generated after high temperature processing such as welding, cutting, hammering, and damage. The object (rust), the residual oil, rust, etc., make the workpiece silver bright and light, thus solving the blackening phenomenon of the workpiece processing.

[0013] The rust cleaning agent of the embodiment has no smoke, no odor, can be operated indoors and outdoors, and has no corrosion to the workpiece. Brush, spray and soak, the best soaking effect. The treated stainless steel surface is smooth, smooth and stable Strong, corrosion resistance is significantly improved, extending equipment life and increasing product added value.

[0014] Embodiments of the present invention also provide a stainless steel workpiece rust removal treatment method, comprising the steps of: preparing a rust cleaning agent as described above; dissolving the rust cleaning agent in water to prepare a cleaning solution, in the cleaning solution The mass percentage of the cleaning agent is 20-100%; the stainless steel workpiece is cleaned and derusted by the cleaning solution, and after the predetermined daytime treatment, the stainless steel workpiece is washed and dried.

[0015] Specifically, the rust removal treatment of the stainless steel workpiece can be performed by brushing, spraying, and immersing, and the immersion effect is optimal. After the cleaning treatment, the descaling cleaning agent is treated at a normal temperature, such as 20-25 degrees. The stainless steel workpiece is preferably immersed in the cleaning solution for a period of 1-3 minutes. Cleaning the crucible, the cleaning solution is installed in the cleaning tank, the cleaning tank adopts an acid-resistant plastic tank, a glass steel tank or a low carbon steel, the glass fiber tank or the low carbon steel is made of a PVC plastic inner liner, and the cleaning solution is used for cleaning the derusting chamber. For 1-3 minutes.

[0016] The rust cleaning agent and the passivation treatment method thereof in the embodiments of the present invention are described below by way of specific examples.

After cleaning the rust agent, the workpiece can be rinsed with clean water. For larger workpieces that cannot be immersed, the rust cleaning agent can be used to thicken the type. After repeatedly coating the workpiece, wipe or rinse with water to ensure the cleaning quality. Save materials. The waste liquid after descaling of the cleaning agent is adjusted by the alkali solution PH=7, and after separation and sedimentation treatment, it is discharged according to the environmental protection standard.

[0017] Embodiment 1

[0018] The ingredients were mixed in the following parts by weight (total 100 parts by weight): 6 parts of oxalic acid, 0.1 part of thiourea, 3.6 parts of citric acid, 0.7 part of ethanol, 0.1 part of nonylphenol ethoxylate, The amount is water, stirring, mixing evenly

, formulated as a cleaning agent.

[0019] Treatment method: preparing the rust cleaning agent as described above; dissolving the rust cleaning agent in water to prepare a cleaning solution, the mass percentage of the cleaning agent in the cleaning solution is 50%; using the cleaning solution for the stainless steel workpiece After cleaning and descaling, after 2 minutes of treatment, the stainless steel workpiece was washed and dried.

[0020] After the above cleaning solution treatment, the surface of the workpiece was observed, and the surface of the stainless steel workpiece was found to be smooth and smooth, without pitting corrosion, and the brightness was increased compared with before, and no oil stains and rust were present.

Embodiment 2

[0022] The components are mixed in the following parts by weight (total 100 parts by weight): 7 parts of oxalic acid, 0.2 parts of thiourea, 4 parts of citric acid, 1 part of ethanol, 0.2 parts of nonylphenol ethoxylate, The amount is water, stirred, evenly mixed, and formulated into a cleaning agent. [0023] Treatment method: preparing the rust cleaning agent as described above; dissolving the rust cleaning agent in water to prepare a cleaning solution, the mass percentage of the cleaning agent in the cleaning solution is 50%; using the cleaning solution for the stainless steel workpiece After cleaning and descaling, after 3 minutes of treatment, the stainless steel workpiece was washed and dried.

[0024] After the above cleaning solution was processed, the surface of the workpiece was observed, and the surface of the stainless steel workpiece was found to be smooth and smooth, without pitting corrosion, and the brightness was increased compared with before, and no oil stains and rust were present.

Embodiment 3

[0026] The ingredients were mixed in the following parts by weight (total 100 parts by weight): 8 parts of oxalic acid, 0.4 parts of thiourea, 5 parts of citric acid, 1.2 parts of ethanol, 0.4 parts of nonylphenol ethoxylate, The amount is water, stirring, mixing evenly

, formulated as a cleaning agent.

[0027] Treatment method: preparing the rust cleaning agent as described above; dissolving the rust cleaning agent in water to prepare a cleaning solution, the mass percentage of the cleaning agent in the cleaning solution is 50%; using the cleaning solution for the stainless steel workpiece After cleaning and descaling, after 3 minutes of treatment, the stainless steel workpiece was washed and dried.

[0028] After the above cleaning solution treatment, the surface of the workpiece was observed, and the surface of the stainless steel workpiece was found to be smooth and smooth, without pitting corrosion, and the brightness was increased compared with before, and no oil stains and rust were present.

Embodiment 4

[0030] The ingredients are mixed in the following parts by weight (total 100 parts by weight): 10 parts of oxalic acid, 0.5 parts of thiourea

6 parts of citric acid, 1.3 parts of ethanol, 0.5 parts of nonylphenol ethoxylate, the balance is water, stirred, and evenly mixed to prepare a cleaning agent.

[0031] Treatment method: preparing the rust cleaning agent as described above; dissolving the rust cleaning agent in water to prepare a cleaning solution, the mass percentage of the cleaning agent in the cleaning solution is 50%; using the cleaning solution for the stainless steel workpiece After cleaning and descaling, after 2 minutes of treatment, the stainless steel workpiece was washed and dried.

[0032] After the above cleaning solution was processed, the surface of the workpiece was observed, and the surface of the stainless steel workpiece was found to be smooth and smooth, without pitting corrosion, and the brightness was increased compared with before, and no oil and rust were present.

Example 5

[0034] The ingredients were mixed in the following parts by weight (total 100 parts by weight): 11 parts of oxalic acid, 0.6 parts of thiourea

, 7 parts of citric acid, 1.4 parts of ethanol, 0.6 parts of nonylphenol ethoxylate, the balance is water, stirred, and evenly mixed to prepare a cleaning agent.

[0035] Treatment method: preparing the rust cleaning agent as described above; dissolving the rust cleaning agent in water to prepare for cleaning and dissolving Liquid, the mass percentage of the cleaning agent in the cleaning solution is 50%; the stainless steel workpiece is cleaned and derusted with a cleaning solution, and after being treated for 3 minutes, the stainless steel workpiece is washed and dried.

[0036] After the above cleaning solution treatment, the surface of the workpiece was observed, and the surface of the stainless steel workpiece was found to be smooth and smooth, without pitting corrosion, and the brightness was increased compared with before, and no oil stains and rust were present.

[0037] It should be noted that the present invention is not limited to the above embodiments, and other changes may be made by those skilled in the art according to the creative spirit of the present invention, and the changes according to the inventive spirit of the present invention should be It is intended to be included within the scope of the invention as claimed.

Claims

claims

[Claim 1] A rust removal cleaning agent used to form a film on the surface of stainless steel workpieces, characterized by:

100 parts by weight, including the following components by weight: 5.7-11 parts of oxalic acid, 0.1-1 part of thiourea, 3.6-7.2 parts of citric acid, 0.7-1.4 parts of ethanol, 0.1-1 part of nonylphenol polyoxyethylene Ether, the balance is water.

[Claim 2] The rust removal cleaning agent as claimed in claim 1, characterized in that the weight portion of the oxalic acid is 6-10 parts.

[Claim 3] The rust removal cleaning agent as claimed in Claim 1,

0.3-0.6 parts.

[Claim 4] The rust removal cleaning agent as claimed in claim 1, characterized in that the weight parts of the citric acid are 4-6 parts.

[Claim 5] The rust removal cleaning agent of claim 1, wherein the weight portion of ethanol is 0.8-1.2 parts.

[Claim 6] The rust removal cleaning agent of claim 1, wherein the weight portion of the nonylphenol polyoxyethylene ether is 0.3-0.6 parts.

[Claim 7] The rust removal cleaning agent as claimed in claim 1, characterized in that the dilution mass concentration of the rust removal cleaning agent when used is 20-100%.

[Claim 8] A method for removing rust from stainless steel workpieces, which includes the following steps: Preparing the rust removal cleaning agent as described in any one of claims 1 to 7; Dissolving the rust removal cleaning agent in water to prepare a cleaning solution, The mass percentage of the cleaning agent in the cleaning solution is 20-100%; the stainless steel workpiece is cleaned and rusted with the cleaning solution, and after a predetermined time of treatment, the stainless steel workpiece is washed with water and dried.

[Claim 9] The rust removal treatment method of stainless steel workpieces as claimed in claim 8, characterized in that when the cleaning solution is used to clean and remove rust, the stainless steel workpieces are soaked, sprayed or brushed with the cleaning solution.

[Claim 10] The rust removal treatment method of stainless steel workpieces according to claim 8, characterized in that the cleaning solution is installed in a cleaning tank, and the cleaning tank adopts an acid-resistant plastic tank, a glass fiber reinforced plastic tank or stainless steel, and the glass fiber reinforced plastics The tank or low carbon steel is lined with PVC plastic, and the cleaning solution takes 1-3 minutes to remove rust.