CN108411305A - A kind of the aluminium alloy polishing additive, aluminium alloy polishing fluid and the polishing process that prevent current mark from generating - Google Patents

Abstract

The present invention relates to a kind of the aluminium alloy polishing additive, aluminium alloy polishing fluid and the polishing processes that prevent current mark from generating, it is related to field of metal surface treatment technology, after solving to be processed by shot blasting aluminium alloy with existing two sour polishing fluids, aluminum alloy surface leads to the problem of current mark, and aluminium alloy polishing additive includes the following component calculated by percentage to the quality：Bright accelerating agent 75 80%, oxidant 15 20%, corrosion inhibiter 2 6%, thickener 1 2%, nonionic propylene oxide condensation product PPG 0.01 0.02%, realize that above-mentioned technical proposal passes through the interaction of special component in additive during aluminium alloy polishes, during being filtered dry after aluminium alloy polishing, cause aluminum alloy surface to generate current mark there is a situation where lasting corrosion when can prevent polishing fluid from being dripped along aluminum alloy surface, enhances brightness effect, yield rate can be improved.

Description

It is a kind of prevent current mark generate aluminium alloy polishing additive, aluminium alloy polishing fluid and Polishing process

Technical field

The present invention relates to field of metal surface treatment technology more particularly to a kind of polishing of aluminium alloy for preventing current mark from generating to add Add agent and polishing process.

Background technology

Aluminium alloying optical polishing refers to being acted on using its selective autolyzing solution in acid or alkaline electrolyte solution, with Reduce the chemical processes of its surface roughness, pH value, this polishing method have equipment it is simple, not by product overall dimensions Limitation, the advantages such as polishing velocity is fast and processing cost is low.

Traditional aluminium alloy polishing mostly uses " three acid " technique, i.e., aluminium alloy is placed on by phosphoric acid, sulfuric acid and nitric acid It is polished in the polishing fluid collectively constituted, since nitric acid contained in three acid polishing liquid is strong oxidizer, and aluminium has strong go back Originality, therefore when aluminium alloy to be placed in three acid polishing liquid, nitric acid decomposition rate is exceedingly fast, and will produce a large amount of tobacco, to It pollutes the environment, while the fluctuation up and down of concentration of nitric acid can cause the polishing bright dark alternating of aluminum alloy surface, yield rate low.

And existing aluminium alloy polishing is typically that aluminium alloy is placed on 90-100 degrees Celsius using " two acid " technique , generate stronger corrosion function in two sour polishing fluids based on phosphorus acid-sulfur acid, to be formed smoothly in aluminum alloy surface Unformed crystal structure, while constantly generating and corroding, being passivated, the cyclic process of diffusion, and then aluminium is made to obtain smooth Surface.

Due to not containing nitric acid in two sour polishing fluids, under the premise of without containing nitric acid, aluminium material surface is difficult in polishing process It is excessively strong so as to cause etching reaction to generate passivation, it is deposited even if still having etching reaction if workpiece goes out after slot , and for using more long tank liquor, the aluminium being dissolved down is more, and tank liquor proportion increases, and aluminium alloy is being transferred to washing Corrode during slot and still carrying out, the tank liquor for being adhered to workpiece surface slides downwards under the effect of gravity, and some places are slow, have Place it is fast, therefore can leave the laterally or longitudinally striped current mark that light and shade is interlocked in aluminium material surface, that is, generate metastatic corrosion, if Polish temperature is excessively high, and current mark can then become the different decorative pattern of light and shade, seriously affect appearance, product rejection rate is made to greatly improve.

In prior art, to prevent the generation of current mark, the operation being usually taken all is fast transfer method, i.e., by aluminium alloy The time control of rinsing bowl was transferred within 30 seconds by polishing liquid bath, but uses the entire mistake of mechanical transfer in prior art Journey generally requires 60 seconds or more, therefore fast transfer is suitable only for being manually operated, and is not suitable for mechanically actuated.

Therefore need to develop a kind of polishing additive, to solve aluminium alloy after going out slot, polishing fluid remain on aluminum substrate after It is continuous to corrode aluminium alloy and aluminum alloy surface is caused to lead to the problem of current mark.

Invention content

First of the present invention is designed to provide a kind of aluminium alloy polishing additive for preventing current mark from generating, and having can subtract The current mark of few aluminum alloy surface, the advantages of enhancing brightness effect, improve yield rate.

The present invention above-mentioned technical purpose technical scheme is that：A kind of aluminium for preventing current mark from generating Alloy polishing additive comprising the following component calculated by percentage to the quality：

Bright accelerating agent 75-80%

Oxidant 15-20%

Composite corrosion inhibitor 2%-6%

Thickener 1-2%

Nonionic propylene oxide condensation product PPG 0.01-0.02%.

Realize above-mentioned technical proposal, during aluminium alloy polishes, by the interaction of special component in additive, Lasting corrosion occurs during being filtered dry after aluminium alloy polishing, when can prevent polishing fluid from being dripped along aluminum alloy surface and causes The case where aluminum alloy surface generation current mark, occurs, and enhances brightness effect, can improve yield rate,

In polishing process, the metal ion in bright accelerating agent is restored in the recess of aluminum alloy surface, so as to prevent The corrosion of recess so that boss rate of dissolution is apparently higher than recess, and then plays the work of smooth aluminum alloy surface With,

Oxidant can be adsorbed on aluminum alloy surface, and one side oxidant is adsorbed on the recess of aluminum alloy surface, can be into one Step reduces the rate of dissolution of recess, and another aspect oxidant can accelerate sticky liquid film forming, so as to improve aluminum alloy surface Performance,

By using compound corrosion inhibitor, the synergistic effect between corrosion inhibiter can be utilized, polynary protection is formed in aluminum alloy surface Film to generate collaboration slow releasing function,

For nonionic propylene oxide condensation product PPG as surfactant, the addition of surfactant can be to aluminum alloy surface Play the role of wetting, to promote bubble to be quickly precipitated, eliminates the generation of pimple, and then improve the matter of workpiece surface Amount,

By the synergistic effect of surfactant and corrosion inhibiter, aluminum alloy surface can be moistened, while being formed in aluminum alloy surface Have sticking foam, so as to prevent tank liquor from gliding to forming current mark in the acceleration of aluminum alloy surface,

The addition of thickener can further enhance the viscosity of the foam formed in aluminum alloy surface, to further slow down slot Gliding speed of the liquid in aluminum alloy surface.

Further, the bright accelerating agent is the complex salt of magnesium metal.

Realize above-mentioned technical proposal, magnesium ion has stronger reproducibility, therefore magnesium ion is in the recess of aluminum alloy surface The reduction reaction of generation is more strong, so that boss rate of dissolution is apparently higher than recess, it is smooth to play The effect on bright aluminum alloy surface selects the complex salt of magnesium metal as bright accelerating agent, and brightness effect is good, and cost is relatively low, Light metal also has environment-friendly advantage simultaneously.

Further, the oxidant is phosphate.

It realizes above-mentioned technical proposal, selects phosphate as oxidant, have the advantages that lower-cost.

Further, the composite corrosion inhibitor includes the following component calculated by percentage to the quality：

Benzotriazole 1-2%

ATPM 2-3%。

Realize above-mentioned technical proposal, anode when benzotriazole obviously can inhibit aluminium to corrode and cathode reaction process, ATPM can prevent partially polished product from assembling in aluminium material surface, compound to form corrosion inhibiter using benzotriazole and ATPM so that Corrosion inhibiter has preferable synergistic effect.

Further, the composite corrosion inhibitor includes the following component calculated by percentage to the quality：

Benzotriazole 1-2%

EDTMP 2-3%。

Realize above-mentioned technical proposal, anode when benzotriazole obviously can inhibit aluminium to corrode and cathode reaction process, EDTMP can prevent partially polished product from assembling in aluminium material surface, compound to form corrosion inhibiter using benzotriazole and EDTMP, make Obtaining corrosion inhibiter has preferable synergistic effect.

Further, the thickener is gum arabic.

Realize above-mentioned technical proposal, gum arabic is a kind of natural plant, have the advantages that it is safe and non-toxic, and I The thickening effect of uncle's natural gum is moderate, can be compatible with other components.

Second object of the present invention is to provide a kind of aluminium alloy polishing fluid for preventing current mark from generating, and aluminium can be reduced by having The advantages of current mark of alloy surface enhances brightness effect, improves yield rate.

The present invention above-mentioned technical purpose technical scheme is that：A kind of aluminium for preventing current mark from generating Alloy polishing fluid, component include:The basal liquid synthesized is matched by phosphoric acid and sulfuric acid;And using the quality of basal liquid as standard, Additive amount is that the aluminium alloy polishing for preventing current mark from generating as described in any scheme in above-mentioned technical proposal of 8-10 grams per liters adds Add agent.

Above-mentioned technical proposal is realized, by the way that aluminium alloy polishing addition is added in phosphoric acid and the basal liquid of sulfuric acid cooperation Agent so that aluminium alloy polishing fluid has the advantages of current mark that can reduce aluminum alloy surface, raising yield rate, by with basal liquid Quality is standard, sets the additive amount of additive to 8-10 grams per liters so that aluminium alloy polishing fluid is with can reduce aluminium alloy Cost can be reduced under the action of the current mark on surface simultaneously.

Further, basal liquid component includes following component by percentage to the quality：

Phosphoric acid 60-80%

Sulfuric acid 20-40%.

Realize that above-mentioned technical proposal, phosphoric acid are a kind of middle strong acid, irritant, no strong corrosive belongs to lower toxicity, sulfuric acid tool There is strong corrosive, there is penetrating odor, belonging to poisoning class can be made by the way that the proportioning of phosphoric acid and sulfuric acid to be configured Harm of the polishing fluid to staff's body can also be reduced by ensureing that polishing liquid energy is realized while its basic function.

Further, the phosphoric acid selects a concentration of 85% phosphoric acid, the sulfuric acid to select a concentration of 98% sulfuric acid.

Realize above-mentioned technical proposal, on the one hand the concentration of commercially available phosphoric acid is 85%, on the other hand, contains 15% in phosphoric acid Polishing fluid can be just balanced by moisture so that the viscosity of polishing fluid is unlikely to Tai Gao or too low, is formed due to polishing Salts substances, which have to certain moisture, to be dissolved, be entirely free of moisture polishing fluid can because occur crystallization, precipitation ask It inscribes and leads to benefit from that the service life is shorter, therefore choose a concentration of 85% phosphoric acid, can be appropriately extended the service life of polishing fluid, and 98% sulphur Acid is the concentrated sulfuric acid, is practically free of moisture, relatively low so as to cause brightness if can reduce polishing effect with the presence of moisture in sulfuric acid, Therefore the sulfuric acid of selection a concentration of 98% can improve the surface brightness of the aluminium alloy after polishing.

Third object of the present invention is to provide a kind of aluminium alloy polishing process have step simple, easily to operate Advantage.

The present invention above-mentioned technical purpose technical scheme is that：A kind of aluminium alloy polishing process, Include the following steps：

1）Aluminium alloy polishing fluid in above-mentioned technical proposal is poured into polishing trough；

2）Aluminium alloy polishing fluid in polishing trough is heated to 90-95 degrees Celsius；

3）Aluminium alloy is placed in polishing trough and is polished 65 seconds；

4）Aluminium alloy is taken in merging rinsing bowl and is cleaned with deionized water；

5）Aluminium alloy taking-up is drained.

Realize that polishing fluid is heated to certain temperature by above-mentioned technical proposal after only need to having configured polishing fluid in proportion, and Aluminium alloy merging is polished, step is simple, easy to operate.

In conclusion the invention has the advantages that：

During aluminium alloy polishes, by the interaction of special component in additive, it is filtered dry after aluminium alloy polishing In the process, lasting corrosion occurs when can prevent polishing fluid from being dripped along aluminum alloy surface and aluminum alloy surface is caused to generate current mark It happens, enhances brightness effect, yield rate can be improved.

Specific implementation mode

In the following detailed description, it is proposed that many details, in order to complete understanding of the present invention.But It will be apparent to those skilled in the art that the present invention can be in some details in not needing these details In the case of implement.Below the description of embodiment is used for the purpose of providing to the present invention more by showing the example of the present invention Understand well.

The technical solution of the embodiment of the present invention is described with embodiment below in conjunction with table.

Embodiment one：

Weigh a concentration of 85% 65 parts of phosphoric acid by weight proportion first, 35 parts of a concentration of 98% sulfuric acid mixes phosphoric acid and sulfuric acid Basis of formation liquid is closed, then weighs the complex salt of 78 parts of magnesium metals in proportion, 16.3 parts of phosphate, 1.6 parts of benzotriazole, 2.5 parts of ATMP, 1.6 parts of gum arabics and 0.015 part of nonionic propylene oxide condensation product PPG, and answering magnesium metal Object, phosphate, benzotriazole, ATMP, gum arabic and nonionic propylene oxide condensation product PPG is closed to be mixed to form Additive is added into basal liquid with the additive amount of 10 grams per liters then on the basis of the content of basal liquid for additive, to shape At polishing fluid, then polishing fluid is poured into polishing trough, and polishing fluid is heated to 90 degrees Celsius, is then placed in aluminium alloy Polishing 65 seconds in polishing trough later drain aluminium alloy taking-up, when Draining time is 120 seconds, by aluminium alloy deionized water It cleans up, observe aluminum alloy surface characteristic and is recorded in table 1.

Embodiment two is to embodiment 15：

To embodiment 15 and embodiment one, difference lies in each component varies in weight embodiment two, each component and its corresponding Weight it is as shown in table 2, the aluminum alloy surface characteristic obtained after the processing of each embodiment is recorded in table 1.

Component and its corresponding weight in 2. embodiment two to embodiment 15 of table

	Phosphoric acid	Sulfuric acid	Magnesium composite salt	Phosphate	Benzotriazole	ATMP	Gum arabic	Surfactant
									Embodiment two	60	40	78	16.3	1.6	2.5	1.6	0.015
Embodiment three	80	20	78	16.3	1.6	2.5	1.6	0.015
									Example IV	65	35	75	16.3	1.6	2.5	1.6	0.015
Embodiment five	65	35	80	16.3	1.6	2.5	1.6	0.015
									Embodiment six	65	35	78	15	1.6	2.5	1.6	0.015
Embodiment seven	65	35	78	20	1.6	2.5	1.6	0.015
									Embodiment eight	65	35	78	16.3	1	2.5	1.6	0.015
Embodiment nine	65	35	78	16.3	2	2.5	1.6	0.015
									Embodiment ten	65	35	78	16.3	1.6	2	1.6	0.015
Embodiment 11	65	35	78	16.3	1.6	3	1.6	0.015
									Embodiment 12	65	35	78	16.3	1.6	2.5	1	0.015
Embodiment 13	65	35	78	16.3	1.6	2.5	2	0.015
									Embodiment 14	65	35	78	16.3	1.6	2.5	1.6	0.01
Embodiment 15	65	35	78	16.3	1.6	2.5	1.6	0.02

Embodiment 16：

Embodiment 16 and embodiment one difference lies in, using the quality of basal liquid as standard in embodiment 16, annex solution Additive amount is 8 grams per liters, and the aluminum alloy surface characteristic obtained after the processing of embodiment 16 is recorded in table 1.

Embodiment 17：

Difference lies in be heated to polishing fluid after 95 degree again to aluminium alloy in embodiment 17 embodiment 17 with embodiment one It is processed by shot blasting, the aluminum alloy surface characteristic obtained after the processing of embodiment 17 is recorded in table 1.

Comparative example one：

Difference lies in the phosphoric acid concentration selected in comparative example one is 80% to comparative example one, after the processing of comparative example one with embodiment one Obtained aluminum alloy surface characteristic is recorded in table 1.

Comparative example two：

Difference lies in the sulfuric acid concentration selected in comparative example two is 90% to comparative example two, after the processing of comparative example two with embodiment one Obtained aluminum alloy surface characteristic is recorded in table 1.

Comparative example three：

Difference lies in do not contain the complex salt of magnesium metal, the processing of comparative example three to comparative example three with embodiment one in comparative example three The aluminum alloy surface characteristic obtained afterwards is recorded in table 1.

Comparative example four：

Difference lies in do not contain phosphate, obtained after the processing of comparative example four comparative example four with embodiment one in comparative example four Aluminum alloy surface characteristic is recorded in table 1.

Comparative example five：

Difference lies in do not contain benzotriazole, obtained after the processing of comparative example five comparative example five with embodiment one in comparative example five Aluminum alloy surface characteristic be recorded in table 1.

Comparative example six：

Difference lies in do not contain ATMP, the aluminium obtained after the processing of comparative example six to comparative example six with embodiment one in comparative example six Alloy surface characteristic is recorded in table 1.

Comparative example seven：

Difference lies in do not contain gum arabic, obtained after the processing of comparative example seven comparative example seven with embodiment one in comparative example seven To aluminum alloy surface characteristic be recorded in table 1.

Comparative example eight：

Difference lies in right without containing nonionic propylene oxide condensation product PPG in comparative example eight with embodiment one for comparative example eight The aluminum alloy surface characteristic obtained after the processing of ratio eight is recorded in table 1.

Comparative example nine：

Difference lies in do not contain benzotriazole, ATMP and nonionic type ring to comparative example nine with embodiment one in comparative example nine Ethylene Oxide condensation product PPG, the aluminum alloy surface characteristic obtained after the processing of comparative example nine are recorded in table 1.

Comparative example ten：

Difference lies in substitute ATMP using EDTMP in comparative example ten, at comparative example ten comparative example ten with embodiment one The aluminum alloy surface characteristic obtained after reason is recorded in table 1.

Data analysis：

Aluminum alloy surface characteristic in 1. each embodiment of table and comparative example

	Striped and decorative pattern	Surfactant foam	Surface brightness	Erosion uniformity
					Embodiment one	Nothing	It is abundant, uniform	Meet model	Uniformly
Embodiment two	Nothing	It is abundant, uniform	Meet model	Uniformly
					Embodiment three	Nothing	It is abundant, uniform	Meet model	Uniformly
Example IV	Nothing	It is abundant, uniform	Meet model	Uniformly
					Embodiment five	Nothing	It is abundant, uniform	Meet model	Uniformly
Embodiment six	Nothing	It is abundant, uniform	Meet model	Uniformly
					Embodiment seven	Nothing	It is abundant, uniform	Meet model	Uniformly
Embodiment eight	Nothing	It is abundant, uniform	Meet model	Uniformly
					Embodiment nine	Nothing	It is abundant, uniform	Meet model	Uniformly
Embodiment ten	Nothing	It is abundant, uniform	Meet model	Uniformly
					Embodiment 11	Nothing	It is abundant, uniform	Meet model	Uniformly
Embodiment 12	Nothing	It is abundant, uniform	Meet model	Uniformly
					Embodiment 13	Nothing	It is abundant, uniform	Meet model	Uniformly
Embodiment 14	Nothing	It is abundant, uniform	Meet model	Uniformly
					Embodiment 15	Nothing	It is abundant, uniform	Meet model	Uniformly
Embodiment 16	Nothing	It is abundant, uniform	Meet model	Uniformly
					Embodiment 17	Nothing	It is abundant, uniform	Meet model	Uniformly
Comparative example one	Nothing	It is abundant, uniform	It is more slightly worse than model	Uniformly
					Comparative example two	Nothing	It is abundant, uniform	It is more slightly worse than model	Generally
Comparative example three	Nothing	It is abundant, uniform	Difference	Uniformly
					Comparative example four	Nothing	It is abundant, uniform	It is poor	Generally
Comparative example five	Slightly	It is abundant, uniform	Meet model	Uniformly
					Comparative example six	Slightly	It is abundant, uniform	Meet model	Uniformly
Comparative example seven	Slightly	It is abundant, uniform	Meet model	Generally
					Comparative example eight	Slightly	Seldom	It is more slightly worse than model	Generally
Comparative example nine	Obviously	Seldom	It is more slightly worse than model	Generally
					Comparative example ten	Nothing	It is abundant, uniform	Meet model	Uniformly

It is compared according to the test result of embodiment one to embodiment 17：Utilize polishing fluid provided by the invention and polishing Aluminium alloy after technique polishing, in Draining time, aluminum alloy surface is unanimously surrounded by uniform and abundant foam, is not occurred The phenomenon that apparent Liquid Residue quickly drips, there is not any striped current mark and light and shade phase in the aluminum alloy surface after washing Between decorative pattern, and aluminum alloy surface extent of corrosion is consistent, and brightness can reach model requirement, and aluminum alloy surface metal-like is strong Power, yield rate are higher.

According to the comparison of the test result of embodiment one and comparative example one it is found that when phosphoric acid concentration is relatively low, electrification occurs for phosphoric acid The degree for learning reaction is weaker, so that the thinner thickness of phosphating coat, so that polishing effect is poor.

According to the comparison of the test result of embodiment one and comparative example two it is found that when the concentration of sulfuric acid is relatively low, sulfuric acid closes aluminium The corrosiveness of gold surface is weaker, and corrosion rate is slow, so that the small scar of aluminum alloy surface and slight sisal line is more difficult goes It removes, so that the surface brightness of aluminium alloy is poor, erosion uniformity is poor.

According to the comparison of the test result of embodiment one and comparative example three it is found that when not being added with bright accelerating agent in polishing fluid When, the rate of dissolution of aluminum alloy surface recess differs smaller with the rate of dissolution of boss, so as to cause aluminum alloy surface It is difficult to be smoothed out, so that the aluminum alloy surface luminance range after polishing.

According to the comparison of the test result of embodiment one and comparative example four it is found that when not containing phosphate in polishing fluid, i.e., The rate of dissolution of aluminum alloy surface recess differs smaller with the rate of dissolution of boss, and aluminum alloy surface viscosity liquid film shape At relatively slow, therefore the luminance range of metal surface, and erosion uniformity is poor.

It can according to the test result comparison of embodiment one and comparative example five, comparative example six, comparative example eight and comparative example nine Know, when being free of benzotriazole in polishing fluid, slight striped and decorative pattern occurs in aluminum alloy surface that treated, when in polishing fluid When without ATMP, there is slight striped and decorative pattern in aluminum alloy surface that treated, when being free of surfactant in polishing fluid, There is slight striped and decorative pattern in aluminum alloy surface that treated, while surfactant foam is seldom, when without containing benzotriazole, When ATMP and nonionic propylene oxide condensation product PPG, there is apparent striped and decorative pattern in aluminum alloy surface that treated, Surfactant foam is seldom simultaneously, and surface brightness is poorer than model, and erosion uniformity is general, illustrates the shape with benzotriazole and ATMP At compound corrosion inhibitor than be used alone benzotriazole or be used alone ATMP corrosion mitigating effect it is more preferable, compound corrosion inhibitor can be with Preferable synergistic effect occurs for surfactant, to reduce the generation of aluminum alloy surface current mark.

According to the comparison of the test result of embodiment one and comparative example seven it is found that when being free of gum arabic in polishing fluid, Aluminum alloy surface will appear slight striped and decorative pattern, illustrate the addition of gum arabic, enhances boss's alloy surface and is formed Foam viscosity, slow down the process that tank liquor glides in aluminum alloy surface.

According to the comparison of the test result of embodiment one and comparative example eight it is found that being free of nonionic propylene oxide condensation product PPG

According to the comparison of the test result of embodiment one and comparative example ten it is found that EDTMP and ATMP all has corrosion inhibition, and equal energy It acts synergistically with surfactant.

The above embodiments are merely illustrative of the technical solutions of the present invention, rather than limits the protection domain of invention.It is aobvious So, described embodiment is only section Example of the present invention, rather than whole embodiments.Based on these embodiments, ability The every other embodiment that domain those of ordinary skill is obtained without creative efforts belongs to institute of the present invention Scope of protection.

Claims (10)

1. a kind of aluminium alloy polishing additive for preventing current mark from generating, which is characterized in that it includes calculating by percentage to the quality Following component：

Bright accelerating agent 75-80%

Oxidant 15-20%

Composite corrosion inhibitor 2%-6%

Thickener 1-2%

Nonionic propylene oxide condensation product PPG 0.01-0.02%.

2. the aluminium alloy polishing additive according to claim 1 for preventing current mark from generating, which is characterized in that the bright rush Into the complex salt that agent is magnesium metal.

3. the aluminium alloy polishing additive according to claim 1 for preventing current mark from generating, which is characterized in that the oxidant For phosphate.

4. the aluminium alloy polishing additive according to claim 1 for preventing current mark from generating, which is characterized in that described compound slow It includes the following component calculated by percentage to the quality to lose agent：

Benzotriazole 1-2%

ATPM 2-3%。

5. it is according to claim 1 prevent current mark generate aluminium alloy polishing additive, the composite corrosion inhibitor include with The following component that mass percent calculates：

Benzotriazole 1-2%

EDTMP 2-3%。

6. the aluminium alloy polishing additive according to claim 1 for preventing current mark from generating, which is characterized in that the thickener For gum arabic.

7. a kind of aluminium alloy polishing fluid for preventing current mark from generating, which is characterized in that its component includes:

The basal liquid synthesized is matched by phosphoric acid and sulfuric acid;

And using the quality of basal liquid as standard, additive amount is 8-10 grams per liters as described in any one of claim 1-6 The aluminium alloy polishing additive for preventing current mark from generating.

8. the aluminium alloy polishing fluid according to claim 7 for preventing current mark from generating, which is characterized in that its basal liquid group subpackage Include following component by percentage to the quality：

Phosphoric acid 60-80%

Sulfuric acid 20-40%.

9. the aluminium alloy polishing fluid according to claim 8 for preventing current mark from generating, which is characterized in that the phosphoric acid is selected dense The phosphoric acid that degree is 85%, the sulfuric acid select a concentration of 98% sulfuric acid.

10. a kind of aluminium alloy polishing process, which is characterized in that include the following steps：

1）Aluminium alloy polishing fluid as described in any one of claim 8-9 is poured into polishing trough；

2）Aluminium alloy polishing fluid in polishing trough is heated to 90-95 degrees Celsius；

3）Aluminium alloy is placed in polishing trough and is polished 65 seconds；

4）Aluminium alloy is taken in merging rinsing bowl and is cleaned with deionized water；

5）Aluminium alloy taking-up is drained.