Hanger soaking deplating agent and preparation method thereof

Abstract

The invention discloses a hanger soaking and deplating agent and a preparation method thereof, the soaking and deplating agent comprises the following raw materials by weight percentage: 10-80% of an oxidizing agent, 1-25% of organic acid, 0.5-25% of a reducing agent, 1-25% of conductive salt, 0.5-25% of a complexing agent, 0.1-0.3% of a corrosion inhibitor, 0.1-0.5% of a surfactant, 0.05-0.2% of a defoaming agent, and the balance of water, and the sum of the raw materials is 100%. The oxidant is ferric trichloride, and the organic acid is sulfamic acid; the reducing agent is oxalic acid; the conductive salt is potassium chloride; the complexing agent is ammonium sulfate; the surfactant is fatty acid methyl ester ethoxylate sulfonate; the corrosion inhibitor is thiourea, and the defoaming agent is an organic silicon defoaming agent; the water is a solvent, specifically deionized water.

Description

Technical Field

[0001] The invention relates to the technical field of rack deplating, in particular to a rack soaking deplating agent and a preparation method thereof. Background Art

[0002] In the electroplating industry, the hanger is a key device for carrying workpieces for electroplating. Its surface is often covered with one or more layers of metal coatings, such as copper, tin, nickel, zinc, etc., due to repeated electroplating processes. These coatings will not only affect the conductivity and mounting capacity of the hanger after long-term use, but may also have an adverse effect on the quality and appearance of the electroplated products. Therefore, regular cleaning of the metal coating on the hanger is an indispensable part of the electroplating process.

[0003] Traditional rack deplating methods mainly include nitric acid deplating and electrolytic deplating. Although the nitric acid deplating method is easy to operate, it has serious environmental problems. Nitric acid is highly oxidizing and corrosive, and will produce a large amount of toxic yellow smoke (mainly containing nitric oxide and nitrogen dioxide) during use. These gases not only seriously pollute the air, but also pose a threat to the health of operators. At the same time, the wastewater generated after nitric acid deplating has an extremely high ammonia nitrogen content, which is difficult to meet environmental emission standards, and requires additional investment of a large amount of funds for wastewater treatment.

[0004] In comparison, the electrolytic dehanging method is relatively environmentally friendly because it does not produce toxic gases. However, the electrolytic dehanging process also has many shortcomings. First, electrolytic dehanging requires special electrolytic equipment and cooling systems, which requires large equipment investment and high power consumption, increasing production costs. Secondly, the temperature of the plating solution will rise during the electrolysis process, and refrigeration equipment is required to cool it down, further increasing energy consumption and equipment complexity. In addition, electrolytic dehanging causes great damage to the hanger, which can easily shorten the service life of the hanger. At the same time, a large amount of sludge will accumulate at the bottom of the electrolytic cell, which needs to be cleaned regularly, increasing manpower and material costs.

[0005] In view of the above problems, it is particularly important to develop an efficient and low-cost rack stripping technology. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned technology and provide a rack soaking stripping agent and a preparation method thereof.

[0007] In order to solve the above technical problems, the technical solution provided by the present invention is a rack immersion stripping agent, which comprises, by weight percentage, 100%, 10-80% oxidant, 1-25% organic acid, 0.5-25% reductant, 1-25% conductive salt, 0.5-25% complexing agent, 0.1-0.5% corrosion inhibitor, 0.1-0.5% surfactant, 0.05-0.2% defoaming agent, and the balance is water.

[0008] Furthermore, the oxidant is ferric chloride.

[0009] Furthermore, the organic acid is aminosulfonic acid.

[0010] Furthermore, the reducing agent is oxalic acid.

[0011] Furthermore, the conductive salt is potassium chloride.

[0012] Furthermore, the complexing agent is ammonium sulfate.

[0013] Furthermore, the corrosion inhibitor is thiourea.

[0014] Furthermore, the surfactant is fatty acid methyl ester ethoxylate sulfonate.

[0015] Furthermore, the corrosion inhibitor is thiourea.

[0016] Furthermore, the defoaming agent is a silicone defoaming agent.

[0017] Furthermore, the water is a solvent, specifically deionized water.

[0018] A second object of the present invention is to provide a method for preparing the above-mentioned immersion stripping agent, comprising the following steps:

[0019] Step 1) first take deionized water and add it into a container;

[0020] Step 2) taking a reducing agent according to weight percentage, adding it into a container, stirring while adding to ensure that it is fully dissolved;

[0021] Step 3) taking a complexing agent by weight percentage, adding it to a container, stirring while adding to ensure that it is fully dissolved;

[0022] Step 4) adding an organic acid by weight into a container, stirring continuously until the organic acid is completely dissolved;

[0023] Step 5) taking a conductive salt by weight percentage, adding it to a container, stirring continuously to ensure full dissolution;

[0024] Step 6) Take the oxidant by weight percentage, and slowly add the ferric chloride powder to the solution while stirring, taking care to avoid precipitation caused by excessive local concentration, and the stirring speed can be appropriately increased;

[0025] Step 7) taking a corrosion inhibitor by weight percentage, adding it into a container, and stirring while adding;

[0026] Step 8) taking a surfactant by weight percentage, adding it into a container, stirring while adding;

[0027] Step 9) taking defoamer by weight percentage and continuing to stir to ensure that each additive is evenly dispersed;

[0028] Step 10) Add deionized water to the required volume according to the final total amount of solution required, and continue stirring for a period of time to ensure that all ingredients are fully mixed.

[0029] The advantages of the present invention compared with the prior art are:

[0030] 1) The rack immersion stripping agent provided by the present invention can quickly and effectively remove the metal coating on the rack at room temperature by scientifically mixing multiple chemical components, while reducing environmental pollution and energy consumption, reducing production costs, and improving the overall environmental protection level and economic benefits of the electroplating industry;

[0031] 2) The speed of removing the hanger is fast. Depending on the thickness of the coating, the hanger can be completely removed in 3 to 20 minutes;

[0032] 3) It does not contain ammonia, nitrogen or chromium, and fully meets the sewage discharge standards;

[0033] 4) No irritating odor or smoke is generated, and no exhaust system is required;

[0034] 5) During the unhooking process, the 316 stainless steel hanger will not be damaged;

[0035] 6) No need to heat, just remove at room temperature;

[0036] 7) The detached metal ions are extracted through an electrolytic ceramic tank to maintain the stability of the metal ions in the solution. DETAILED DESCRIPTION

[0037] The following is a further detailed description of a rack soaking stripping agent and a preparation method thereof in conjunction with embodiments of the present invention.

[0038] Example 1

[0039] A rack soaking and deplating agent, wherein the soaking and deplating agent, calculated by weight percentage as 100%, comprises: 10-80% oxidant, 1-25% organic acid, 0.5-25% reducing agent, 1-25% conductive salt, 0.5-25% complexing agent, 0.1-0.5% corrosion inhibitor, 0.1-0.3% surfactant, 0.05-0.2% defoaming agent, and the balance is water, and the sum of all raw materials is 100%;

[0040] Among them: the oxidant is ferric chloride, the organic acid is aminosulfonic acid; the reducing agent is oxalic acid; the conductive salt is potassium chloride; the complexing agent is ammonium sulfate, the corrosion inhibitor is thiourea; the surfactant is fatty acid methyl ester ethoxylate sulfonate; the defoaming agent is an organosilicon defoaming agent; and the water is a solvent, specifically deionized water.

[0041] The preparation method of the above-mentioned immersion stripping agent comprises the following steps:

[0042] Step 1) first take deionized water and add it into a container;

[0043] Step 2) taking a reducing agent according to weight percentage, adding it into a container, stirring while adding to ensure that it is fully dissolved;

[0044] Step 3) taking a complexing agent by weight percentage, adding it to a container, stirring while adding to ensure that it is fully dissolved;

[0045] Step 4) adding an organic acid by weight into a container, stirring continuously until the organic acid is completely dissolved;

[0046] Step 5) taking a conductive salt by weight percentage, adding it to a container, stirring continuously to ensure full dissolution;

[0047] Step 6) Take the oxidant by weight percentage, and slowly add the ferric chloride powder to the solution while stirring, taking care to avoid precipitation caused by excessive local concentration, and the stirring speed can be appropriately increased;

[0048] Step 7) taking a corrosion inhibitor by weight percentage, adding it into a container, and stirring while adding;

[0049] Step 8) taking a surfactant by weight percentage, adding it into a container, stirring while adding;

[0050] Step 9) taking defoamer by weight percentage and continuing to stir to ensure that each additive is evenly dispersed;

[0051] Step 10) Add deionized water to the required volume according to the final total amount of solution required, and continue stirring for a period of time to ensure that all ingredients are fully mixed.

[0052] Example 2

[0053] When the rack obtained in Example 1 is used to soak the deplating agent for deplating, the deplating agent can be placed in a container with a stirring device, and then the rack to be deplated is completely immersed in the prepared deplating agent. The deplating operation can be performed at room temperature without heating, and no irritating odor or smoke is generated during the deplating process.

[0054] Adjust the soaking time according to the thickness of the coating and specific needs. Generally, the coating can be completely removed from the hanger within 3 to 20 minutes;

[0055] During the soaking process, pay attention to the stripping effect and adjust the soaking time or reagent concentration according to the actual situation;

[0056] After the stripping is completed, take out the hanger and rinse it with clean water. The hanger can be used for a long time after soaking in the stripping agent.

[0057] The present invention and its implementation methods are described above, and such description is not restrictive. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design structures and embodiments similar to the technical solution without creativity, which should all fall within the protection scope of the present invention.

Claims

1. A rack soaked in a stripping agent, characterized in that: The immersion stripping agent, calculated by weight percentage as 100%, includes 10-80% oxidant, 1-25% organic acid, 0.5-25% reducing agent, 1-25% conductive salt, 0.5-25% complexing agent, 0.1-0.3% corrosion inhibitor, 0.1-0.5% surfactant, 0.05-0.2% defoaming agent, and the balance is water.

2. The immersion stripping agent according to claim 1, characterized in that: The oxidant is ferric chloride; the organic acid is aminosulfonic acid.

3. The immersion stripping agent according to claim 1, characterized in that: The reducing agent is oxalic acid.

4. The immersion stripping agent according to claim 1, characterized in that: The conductive salt is potassium chloride.

5. The immersion stripping agent according to claim 1, characterized in that: The complexing agent is ammonium sulfate.

6. The immersion stripping agent according to claim 1, characterized in that: The surfactant is fatty acid methyl ester ethoxylate sulfonate.

7. The rack soaking stripping agent according to claim 1, characterized in that: The defoamer is an organosilicon defoamer.

8. The rack soaking stripping agent according to claim 1, characterized in that: The water is a solvent, specifically deionized water.

9. The rack soaking stripping agent according to claim 1, characterized in that: The corrosion inhibitor is thiourea.

10. The method for preparing the immersion stripping agent according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1) first take deionized water and add it into a container; Step 2) taking a reducing agent according to weight percentage, adding it into a container, stirring while adding to ensure that it is fully dissolved; Step 3) taking a complexing agent by weight percentage, adding it to a container, stirring while adding to ensure that it is fully dissolved; Step 4) adding an organic acid by weight into a container, stirring continuously until the organic acid is completely dissolved; Step 5) taking a conductive salt by weight percentage, adding it to a container, stirring continuously to ensure full dissolution; Step 6) Take the oxidant by weight percentage, and slowly add the ferric chloride powder to the solution while stirring, taking care to avoid precipitation caused by excessive local concentration, and the stirring speed can be appropriately increased; Step 7) taking a corrosion inhibitor by weight percentage, adding it into a container, and stirring while adding; Step 8) taking a surfactant by weight percentage, adding it into a container, stirring while adding; Step 9) taking defoamer by weight percentage and continuing to stir to ensure that each additive is evenly dispersed; Step 10) Add deionized water to the required volume according to the final total amount of solution required, and continue stirring for a period of time to ensure that all ingredients are fully mixed.