CN113818023A - High-finish-degree LED aluminum frame surface powder spraying pretreatment process - Google Patents
High-finish-degree LED aluminum frame surface powder spraying pretreatment process Download PDFInfo
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- CN113818023A CN113818023A CN202111105169.XA CN202111105169A CN113818023A CN 113818023 A CN113818023 A CN 113818023A CN 202111105169 A CN202111105169 A CN 202111105169A CN 113818023 A CN113818023 A CN 113818023A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
- B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/22—Light metals
Abstract
The invention discloses a high-finish LED aluminum frame surface powder spraying pretreatment process, which comprises the following steps: s1: preparing an aluminum frame, inspecting the aluminum frame, adjusting a feeding frame, and fixing the aluminum frame on the feeding frame; s2: acid washing: removing oxides on the surface of the aluminum frame by using an acid solution; s3: carrying out water sand blasting treatment on the surface of the aluminum frame, and spraying a mixture of water and sand onto the surface of the aluminum frame under certain pressure by using a water gun; s4: polishing treatment: polishing the surface of the aluminum frame by using abrasive cloth or abrasive paper with the mesh number higher than 100 meshes; s5: pre-degreasing: adding a pre-degreasing agent into the degreasing tank, and hoisting the aluminum frame in the step S4 into the degreasing tank through a crane for pre-degreasing; wherein the pre-degreasing agent comprises, by weight, 80-140 parts of phosphoric acid, 40-60 parts of sulfuric acid, 35-50 parts of sodium gluconate, 25-55 parts of dipropylene glycol, 20-40 parts of ferric sulfate and 10-30 parts of an oxidizing agent. The treatment process can save cost and resources, has higher economic and social benefits, and is easy to popularize.
Description
Technical Field
The invention relates to the technical field of aluminum frame treatment, in particular to a surface powder spraying pretreatment process for a high-finish LED aluminum frame.
Background
The light emitting diode, abbreviated As LED, refers to one of semiconductor diodes made of compounds containing gallium (Ga), arsenic (As), phosphorus (P), nitrogen (N), etc. that can convert electric energy into light energy. When electrons and holes are recombined, visible light is radiated, so that the light-emitting diode can be manufactured. In circuits and instruments as indicator lights or to form text or numerical displays. Gallium arsenide diodes emit red light, gallium phosphide diodes emit green light, silicon carbide diodes emit yellow light, and gallium nitride diodes emit blue light. Organic light emitting diodes OLED and inorganic light emitting diodes LED are classified by their chemical properties.
At present, the aluminum frame is a metal frame which fixes the LED lamp to prevent the LED lamp from being damaged and beautifies the LED lamp, and is very common in the market. The aluminum frame needs to be subjected to powder spraying treatment in the production process, and the existing aluminum frame powder spraying process has great pollution to the environment and influences on the health of operators.
Therefore, a high-finish LED aluminum frame surface powder spraying pretreatment process is provided.
Disclosure of Invention
The invention mainly aims to provide a high-finish LED aluminum frame surface powder spraying pretreatment process which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
a high-finish LED aluminum frame surface powder spraying pretreatment process comprises the following steps:
s1: preparing an aluminum frame, inspecting the aluminum frame, adjusting a feeding frame, and fixing the aluminum frame on the feeding frame;
s2: acid washing: removing oxides on the surface of the aluminum frame by using an acid solution;
s3: carrying out water sand blasting treatment on the surface of the aluminum frame, and spraying a mixture of water and sand onto the surface of the aluminum frame under certain pressure by using a water gun;
s4: polishing treatment: polishing the surface of the aluminum frame by using abrasive cloth or abrasive paper with the mesh number higher than 100 meshes;
s5: pre-degreasing: adding a pre-degreasing agent into the degreasing tank, and hoisting the aluminum frame in the step S4 into the degreasing tank through a crane for pre-degreasing;
wherein the pre-degreasing agent comprises 80-140 parts by weight of phosphoric acid, 40-60 parts by weight of sulfuric acid, 35-50 parts by weight of sodium gluconate, 25-55 parts by weight of dipropylene glycol, 20-40 parts by weight of ferric sulfate and 10-30 parts by weight of oxidant;
s6: washing with water: cleaning the aluminum frame in the step S5, and cleaning the aluminum frame by using tap water at room temperature for 1-3 minutes;
s7: degreasing treatment: diluting free acid with water at 40-60 deg.C, and spraying for 4-6 min to pre-degrease the aluminum frame;
s8: washing with water: cleaning the aluminum frame in the step S7, and cleaning the aluminum frame by using tap water at room temperature for 1-3 minutes;
s9: alkali washing: adding an alkaline washing agent and water into the alkaline washing tank to form alkaline washing liquid, and hoisting the aluminum frame in the S8 into the alkaline washing tank through a crane to perform alkaline washing treatment;
wherein the alkaline washing liquid comprises 30-50 parts by weight of sodium phosphate, 25-35 parts by weight of sodium silicate, 60-80 parts by weight of sodium hydroxide, 20-40 parts by weight of phosphoric acid and 20-40 parts by weight of sodium gluconate;
s10: washing with water: cleaning the aluminum frame in the step S9, and cleaning the aluminum frame by using tap water at room temperature for 1-3 minutes;
s11: and (3) chromium-free passivation treatment: adding a passivating agent into the passivating tank, and carrying out surface passivation treatment on the aluminum frame in S10;
wherein the passivating agent comprises 50-60 parts by weight of ammonium fluotitanate, 20-40 parts by weight of nitric acid, 15-30 parts by weight of calcium carbonate, 40-50 parts by weight of organic phosphonic acid and 20-40 parts by weight of silane coupling agent;
s12: washing with water: cleaning the aluminum frame in the step S11, and cleaning the aluminum frame by using tap water at room temperature for 1-3 minutes;
s13: drying: placing the aluminum frame into a drying furnace for baking at the temperature of 120 ℃ and 150 ℃, wherein the time is as follows: 5-10 minutes.
Furthermore, the treatment temperature of the pre-degreasing is 25 ℃, and the treatment time is 8-12 minutes.
Further, in S5, hydrogen peroxide or potassium permanganate is used as an oxidant;
the oxidant is a substance that obtains electrons in a redox reaction; the oxidant has oxidability, the valence of the obtained electrons is reduced, and reduction reaction is carried out to obtain a reduction product; the oxidant has the property of getting electrons, namely the oxidability, and the determinants of the oxidability are the electron-getting tendency of high-valence elements in the oxidant; in solution, according to the theory of electric double layers, the magnitude of the oxidation is reflected as the standard hydrogen electrode potential of the oxidant: the higher the potential, the stronger the oxidation; the lower the potential, the weaker the oxidation and, correspondingly, the stronger the reduction in its reduced state;
hydrogen peroxide: hydrogen peroxide is an inorganic compound of the formula H2O 2; pure hydrogen peroxide is light blue viscous liquid, can be mixed and dissolved with water in any proportion, is a strong oxidant, and the water solution is commonly called hydrogen peroxide and is colorless transparent liquid; the water solution is suitable for medical wound disinfection, environmental disinfection and food disinfection; in general, the catalyst can be slowly decomposed into water and oxygen, but the decomposition speed is extremely slow, and the method for accelerating the reaction speed is to add the catalyst, namely manganese dioxide and the like or to irradiate the catalyst by short-wave rays;
potassium permanganate: potassium permanganate is a strong oxidant, is black purple, elongated prismatic crystal or particle, has blue metallic luster, is odorless, is easy to explode when being contacted with certain organic matters or easily-oxidized substances, is dissolved in water and alkali liquor, is slightly soluble in methanol, acetone and sulfuric acid, has a molecular formula of KMnO4, and has a molecular weight of 158.034; melting point 240 ℃, but contact with flammable materials may cause fire; in chemical production, it is widely used as an oxidizing agent.
Further, in S7, the free acidity is 3-6 points;
the free acid, also known as 3, 3, 5, 5-tetramethylbenzidine, foreign name TMB, melting point 168-.
Further, in S2, the acidic solution is one of potassium hydroxide, sodium bicarbonate, sodium hypophosphite, sodium carbonate, sulfuric acid, nitric acid, and sulfurous acid;
acidic refers to the ability of a substance to donate hydrogen ions to other substances in a solvent; at 25 ℃, when the pH is less than 7, the solution is acidic; acidity is in a sense inversely proportional to oxidation; acidity, which generally changes purple litmus into red, etc.; the pH value of the solution is below 7 at normal temperature, and the solution is in an acidic reaction; the smaller the pH value, the stronger the acidity; the acid can generate neutralization reaction with alkali to generate salt and water, can change the color of an acid-base indicator, can react with active metal to generate hydrogen, and also has the general property of generating new acid and new salt through double decomposition reaction with certain salt, namely the acidity of the acid;
potassium hydroxide, a common inorganic base, has the chemical formula of KOH, has a molecular weight of 56.1, and is white powder or flake solid at room temperature; the property is similar to sodium hydroxide, the sodium hydroxide has strong basicity and corrosivity, and the potassium carbonate is prepared by easily absorbing moisture in air to deliquesce and absorbing carbon dioxide; dissolved in about 0.6 parts hot water, 0.9 parts cold water, 3 parts ethanol, 2.5 parts glycerol, slightly soluble in ether; generate a large amount of heat when dissolved in water, alcohol or treated with acid; moderate toxicity, half lethal dose (rat, oral) 1230 mg/kg;
sodium bicarbonate, an inorganic salt, is a white crystalline powder, odorless, tasteless and readily soluble in water; slowly decomposing in humid air or hot air to generate carbon dioxide, and heating to 270 deg.C for complete decomposition; when meeting acid, the acid is strongly decomposed to generate carbon dioxide;
sodium hypophosphite, an inorganic salt with the chemical formula of NaH2PO2, monoclinic crystal or crystal with pearl luster or white crystalline powder; easily soluble in water, ethanol, and glycerol; slightly soluble in ammonia and ammonia water; insoluble in diethyl ether;
sodium carbonate, an inorganic compound, has a molecular formula of Na2CO3, a molecular weight of 105.99, and is also called soda ash, but is classified as salt and not alkali; also known as soda or soda ash in international trade; it is an important inorganic chemical raw material, mainly used for the production of plate glass, glass products and ceramic glaze; also widely used for domestic washing, acid neutralization, food processing and the like;
sulfuric acid, an inorganic compound, of the formula H2SO4, the most important oxyacid of sulfur; the pure sulfuric acid is colorless oily liquid, is crystallized at 10.36 ℃, is usually prepared by various aqueous solutions with different concentrations by a tower method and a contact method; the former is crude dilute sulfuric acid, and the mass fraction is about 75% generally; the latter can obtain concentrated sulfuric acid with mass fraction of 98.3%, boiling point of 338 ℃, relative density of 1.84;
nitric acid, a strong oxidizing and corrosive strong acid, belongs to a monobasic inorganic strong acid, is one of six inorganic strong acids, and is also an important chemical raw material, and the chemical formula is HNO3The aqueous solution is commonly called nitric acid or ammonia nitrogen water; can be used for preparing chemical fertilizers, pesticides, explosives, dyes, salts and the like in industry; in organic chemistry, the mixed solution of concentrated nitric acid and concentrated sulfuric acid is an important nitration reagent; the hazard symbols are O (oxidizing agent) and C (corrosive); the anhydride of nitric acid is dinitrogen pentoxide (N2O 5);
sulfurous acid, which is an aqueous solution of sulfur dioxide and has a chemical formula of H2SO3, belongs to a colorless transparent liquid, is easy to decompose, and has a suffocation smell of sulfur dioxide; can be used as analytical reagent, reducing agent, antiseptic, etc.
Compared with the prior art, the invention has the following beneficial effects: the aluminum frame is treated through a plurality of processes, so that impurities on the aluminum frame can be removed completely, the smoothness and brightness of the aluminum frame are improved, the aluminum frame is free of quality problems, meanwhile, the attractiveness of the aluminum frame can be improved, the environmental pollution is small through the use of a pre-degreasing agent, an alkaline detergent and a passivating agent, the harm to a human body is small, and the environmental protection performance of the aluminum frame can be improved; the aluminum frame surface cleaning agent can clean the residual pre-degreasing agent, the alkaline cleaning agent, the passivating agent and the residual impurities on the surface of the aluminum frame by washing with tap water, so that the surface of the aluminum frame is cleaner, and the aluminum frame is convenient to perform powder spraying operation subsequently.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example one
A high-finish LED aluminum frame surface powder spraying pretreatment process comprises the following steps:
s1: preparing an aluminum frame, inspecting the aluminum frame, adjusting a feeding frame, and fixing the aluminum frame on the feeding frame;
s2: acid washing: removing oxides on the surface of the aluminum frame by using an acid solution;
s3: carrying out water sand blasting treatment on the surface of the aluminum frame, and spraying a mixture of water and sand onto the surface of the aluminum frame under certain pressure by using a water gun;
s4: polishing treatment: polishing the surface of the aluminum frame by using abrasive cloth or abrasive paper with the mesh number higher than 100 meshes;
s5: pre-degreasing: adding a pre-degreasing agent into the degreasing tank, and hoisting the aluminum frame in the step S4 into the degreasing tank through a crane for pre-degreasing;
wherein the pre-degreasing agent comprises 80 parts by weight of phosphoric acid, 40 parts by weight of sulfuric acid, 35 parts by weight of sodium gluconate, 25 parts by weight of dipropylene glycol, 20 parts by weight of ferric sulfate and 10 parts by weight of an oxidizing agent;
s6: washing with water: cleaning the aluminum frame in the step S5, and cleaning for 1 minute by using tap water at room temperature;
s7: degreasing treatment: diluting free acid with water at 40-60 deg.C, and performing spray pre-degreasing treatment on the aluminum frame for 4 min;
s8: washing with water: cleaning the aluminum frame in the step S7, and cleaning for 1 minute by using tap water at room temperature;
s9: alkali washing: adding an alkaline washing agent and water into the alkaline washing tank to form alkaline washing liquid, and hoisting the aluminum frame in the S8 into the alkaline washing tank through a crane to perform alkaline washing treatment;
wherein the alkaline washing solution comprises 30 parts by weight of sodium phosphate, 25 parts by weight of sodium silicate, 60 parts by weight of sodium hydroxide, 20 parts by weight of phosphoric acid and 20 parts by weight of sodium gluconate;
s10: washing with water: cleaning the aluminum frame in the step S9, and cleaning for 1 minute by using tap water at room temperature;
s11: and (3) chromium-free passivation treatment: adding a passivating agent into the passivating tank, and carrying out surface passivation treatment on the aluminum frame in S10;
wherein the passivating agent comprises 50 parts by weight of ammonium fluotitanate, 20 parts by weight of nitric acid, 15 parts by weight of calcium carbonate, 40 parts by weight of organic phosphonic acid and 20 parts by weight of silane coupling agent;
s12: washing with water: cleaning the aluminum frame in the step S11, and cleaning for 1 minute by using tap water at room temperature;
s13: drying: placing the aluminum frame into a drying furnace for baking at the temperature of 120 ℃ for: for 5 minutes.
Wherein, the treatment temperature of the pre-degreasing is 25 ℃, and the treatment time is 8 minutes.
Wherein in S5, the oxidant is hydrogen peroxide.
Among them, in S7, the free acidity was 3 points.
In S2, the acidic solution is potassium hydroxide.
Example two
A high-finish LED aluminum frame surface powder spraying pretreatment process comprises the following steps:
s1: preparing an aluminum frame, inspecting the aluminum frame, adjusting a feeding frame, and fixing the aluminum frame on the feeding frame;
s2: acid washing: removing oxides on the surface of the aluminum frame by using an acid solution;
s3: carrying out water sand blasting treatment on the surface of the aluminum frame, and spraying a mixture of water and sand onto the surface of the aluminum frame under certain pressure by using a water gun;
s4: polishing treatment: polishing the surface of the aluminum frame by using abrasive cloth or abrasive paper with the mesh number higher than 100 meshes;
s5: pre-degreasing: adding a pre-degreasing agent into the degreasing tank, and hoisting the aluminum frame in the step S4 into the degreasing tank through a crane for pre-degreasing;
wherein the pre-degreasing agent comprises 90 parts by weight of phosphoric acid, 45 parts by weight of sulfuric acid, 40 parts by weight of sodium gluconate, 30 parts by weight of dipropylene glycol, 25 parts by weight of ferric sulfate and 15 parts by weight of an oxidizing agent;
s6: washing with water: cleaning the aluminum frame in the step S5, and cleaning for 1 minute by using tap water at room temperature;
s7: degreasing treatment: diluting free acid with water at 40-60 deg.C, and performing spray pre-degreasing treatment on the aluminum frame for 4 min;
s8: washing with water: cleaning the aluminum frame in the step S7, and cleaning for 1 minute by using tap water at room temperature;
s9: alkali washing: adding an alkaline washing agent and water into the alkaline washing tank to form alkaline washing liquid, and hoisting the aluminum frame in the S8 into the alkaline washing tank through a crane to perform alkaline washing treatment;
wherein the alkaline washing solution comprises 35 parts by weight of sodium phosphate, 30 parts by weight of sodium silicate, 65 parts by weight of sodium hydroxide, 25 parts by weight of phosphoric acid and 25 parts by weight of sodium gluconate;
s10: washing with water: cleaning the aluminum frame in the step S9, and cleaning for 1 minute by using tap water at room temperature;
s11: and (3) chromium-free passivation treatment: adding a passivating agent into the passivating tank, and carrying out surface passivation treatment on the aluminum frame in S10;
the passivating agent comprises 55 parts by weight of ammonium fluotitanate, 25 parts by weight of nitric acid, 20 parts by weight of calcium carbonate, 45 parts by weight of organic phosphonic acid and 25 parts by weight of silane coupling agent;
s12: washing with water: cleaning the aluminum frame in the step S11, and cleaning for 1 minute by using tap water at room temperature;
s13: drying: placing the aluminum frame into a drying furnace for baking at the temperature of 125 ℃ for: for 6 minutes.
Wherein, the treatment temperature of the pre-degreasing is 25 ℃, and the treatment time is 9 minutes.
Wherein in S5, the oxidant is hydrogen peroxide.
Among them, in S7, the free acidity was 4 points.
In S2, the acidic solution is sodium bicarbonate.
EXAMPLE III
A high-finish LED aluminum frame surface powder spraying pretreatment process comprises the following steps:
s1: preparing an aluminum frame, inspecting the aluminum frame, adjusting a feeding frame, and fixing the aluminum frame on the feeding frame;
s2: acid washing: removing oxides on the surface of the aluminum frame by using an acid solution;
s3: carrying out water sand blasting treatment on the surface of the aluminum frame, and spraying a mixture of water and sand onto the surface of the aluminum frame under certain pressure by using a water gun;
s4: polishing treatment: polishing the surface of the aluminum frame by using abrasive cloth or abrasive paper with the mesh number higher than 100 meshes;
s5: pre-degreasing: adding a pre-degreasing agent into the degreasing tank, and hoisting the aluminum frame in the step S4 into the degreasing tank through a crane for pre-degreasing;
wherein the pre-degreasing agent comprises 90 parts by weight of phosphoric acid, 50 parts by weight of sulfuric acid, 45 parts by weight of sodium gluconate, 35 parts by weight of dipropylene glycol, 30 parts by weight of ferric sulfate and 20 parts by weight of an oxidizing agent;
s6: washing with water: cleaning the aluminum frame in the step S5, and cleaning for 2 minutes by using tap water at room temperature;
s7: degreasing treatment: diluting free acid with water at 40-60 deg.C, and spraying for 5 min to pre-degrease the aluminum frame;
s8: washing with water: cleaning the aluminum frame in the step S7, and cleaning for 2 minutes by using tap water at room temperature;
s9: alkali washing: adding an alkaline washing agent and water into the alkaline washing tank to form alkaline washing liquid, and hoisting the aluminum frame in the S8 into the alkaline washing tank through a crane to perform alkaline washing treatment;
wherein the alkaline washing solution comprises, by weight, 40 parts of sodium phosphate, 35 parts of sodium silicate, 70 parts of sodium hydroxide, 35 parts of phosphoric acid and 35 parts of sodium gluconate;
s10: washing with water: cleaning the aluminum frame in the step S9, and cleaning for 2 minutes by using tap water at room temperature;
s11: and (3) chromium-free passivation treatment: adding a passivating agent into the passivating tank, and carrying out surface passivation treatment on the aluminum frame in S10;
wherein the passivating agent comprises 60 parts by weight of ammonium fluotitanate, 30 parts by weight of nitric acid, 25 parts by weight of calcium carbonate, 50 parts by weight of organic phosphonic acid and 30 parts by weight of silane coupling agent;
s12: washing with water: cleaning the aluminum frame in the step S11, and cleaning for 2 minutes by using tap water at room temperature;
s13: drying: putting the aluminum frame into a drying furnace for baking at the temperature of 130 ℃, and keeping the time: for 7 minutes.
Wherein, the treatment temperature of the pre-degreasing is 25 ℃, and the treatment time is 10 minutes.
Wherein in S5, the oxidant is potassium permanganate.
Among them, in S7, the free acidity was 5 points.
Wherein in S2, the acidic solution is sodium hypophosphite.
Example four
A high-finish LED aluminum frame surface powder spraying pretreatment process comprises the following steps:
s1: preparing an aluminum frame, inspecting the aluminum frame, adjusting a feeding frame, and fixing the aluminum frame on the feeding frame;
s2: acid washing: removing oxides on the surface of the aluminum frame by using an acid solution;
s3: carrying out water sand blasting treatment on the surface of the aluminum frame, and spraying a mixture of water and sand onto the surface of the aluminum frame under certain pressure by using a water gun;
s4: polishing treatment: polishing the surface of the aluminum frame by using abrasive cloth or abrasive paper with the mesh number higher than 100 meshes;
s5: pre-degreasing: adding a pre-degreasing agent into the degreasing tank, and hoisting the aluminum frame in the step S4 into the degreasing tank through a crane for pre-degreasing;
wherein the pre-degreasing agent comprises 140 parts by weight of phosphoric acid, 60 parts by weight of sulfuric acid, 50 parts by weight of sodium gluconate, 55 parts by weight of dipropylene glycol, 40 parts by weight of ferric sulfate and 30 parts by weight of an oxidizing agent;
s6: washing with water: cleaning the aluminum frame in the step S5, and cleaning for 3 minutes by using tap water at room temperature;
s7: degreasing treatment: diluting free acid with water at 40-60 deg.C, and performing spray pre-degreasing treatment on the aluminum frame for 6 min;
s8: washing with water: cleaning the aluminum frame in the step S7, and cleaning for 3 minutes by using tap water at room temperature;
s9: alkali washing: adding an alkaline washing agent and water into the alkaline washing tank to form alkaline washing liquid, and hoisting the aluminum frame in the S8 into the alkaline washing tank through a crane to perform alkaline washing treatment;
wherein the alkaline washing solution comprises 50 parts by weight of sodium phosphate, 35 parts by weight of sodium silicate, 80 parts by weight of sodium hydroxide, 40 parts by weight of phosphoric acid and 40 parts by weight of sodium gluconate;
s10: washing with water: cleaning the aluminum frame in the step S9, and cleaning for 3 minutes by using tap water at room temperature;
s11: and (3) chromium-free passivation treatment: adding a passivating agent into the passivating tank, and carrying out surface passivation treatment on the aluminum frame in S10;
wherein the passivating agent comprises 60 parts by weight of ammonium fluotitanate, 40 parts by weight of nitric acid, 30 parts by weight of calcium carbonate, 50 parts by weight of organic phosphonic acid and 40 parts by weight of silane coupling agent;
s12: washing with water: cleaning the aluminum frame in the step S11, and cleaning for 3 minutes by using tap water at room temperature;
s13: drying: placing the aluminum frame into a drying furnace for baking at the temperature of 150 ℃ for: for 9 minutes.
Wherein, the treatment temperature of the pre-degreasing is 25 ℃, and the treatment time is 12 minutes.
Wherein in S5, the oxidant is potassium permanganate.
Among them, in S7, the free acidity was 5 points.
In S2, the acidic solution is sulfuric acid.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A high-finish LED aluminum frame surface powder spraying pretreatment process is characterized by comprising the following steps:
s1: preparing an aluminum frame, inspecting the aluminum frame, adjusting a feeding frame, and fixing the aluminum frame on the feeding frame;
s2: acid washing: removing oxides on the surface of the aluminum frame by using an acid solution;
s3: carrying out water sand blasting treatment on the surface of the aluminum frame, and spraying a mixture of water and sand onto the surface of the aluminum frame under certain pressure by using a water gun;
s4: polishing treatment: polishing the surface of the aluminum frame by using abrasive cloth or abrasive paper with the mesh number higher than 100 meshes;
s5: pre-degreasing: adding a pre-degreasing agent into the degreasing tank, and hoisting the aluminum frame in the step S4 into the degreasing tank through a crane for pre-degreasing;
wherein the pre-degreasing agent comprises 80-140 parts by weight of phosphoric acid, 40-60 parts by weight of sulfuric acid, 35-50 parts by weight of sodium gluconate, 25-55 parts by weight of dipropylene glycol, 20-40 parts by weight of ferric sulfate and 10-30 parts by weight of oxidant;
s6: washing with water: cleaning the aluminum frame in the step S5, and cleaning the aluminum frame by using tap water at room temperature for 1-3 minutes;
s7: degreasing treatment: diluting free acid with water at 40-60 deg.C, and spraying for 4-6 min to pre-degrease the aluminum frame;
s8: washing with water: cleaning the aluminum frame in the step S7, and cleaning the aluminum frame by using tap water at room temperature for 1-3 minutes;
s9: alkali washing: adding an alkaline washing agent and water into the alkaline washing tank to form alkaline washing liquid, and hoisting the aluminum frame in the S8 into the alkaline washing tank through a crane to perform alkaline washing treatment;
wherein the alkaline washing liquid comprises 30-50 parts by weight of sodium phosphate, 25-35 parts by weight of sodium silicate, 60-80 parts by weight of sodium hydroxide, 20-40 parts by weight of phosphoric acid and 20-40 parts by weight of sodium gluconate;
s10: washing with water: cleaning the aluminum frame in the step S9, and cleaning the aluminum frame by using tap water at room temperature for 1-3 minutes;
s11: and (3) chromium-free passivation treatment: adding a passivating agent into the passivating tank, and carrying out surface passivation treatment on the aluminum frame in S10;
wherein the passivating agent comprises 50-60 parts by weight of ammonium fluotitanate, 20-40 parts by weight of nitric acid, 15-30 parts by weight of calcium carbonate, 40-50 parts by weight of organic phosphonic acid and 20-40 parts by weight of silane coupling agent;
s12: washing with water: cleaning the aluminum frame in the step S11, and cleaning the aluminum frame by using tap water at room temperature for 1-3 minutes;
s13: drying: placing the aluminum frame into a drying furnace for baking at the temperature of 120 ℃ and 150 ℃, wherein the time is as follows: 5-10 minutes.
2. The surface powder spraying pretreatment process for the high-finish LED aluminum frame according to claim 1, characterized in that: the pre-degreasing treatment temperature is 25 ℃, and the treatment time is 8-12 minutes.
3. The surface powder spraying pretreatment process for the high-finish LED aluminum frame according to claim 1, characterized in that: in S5, the oxidant is hydrogen peroxide or potassium permanganate.
4. The surface powder spraying pretreatment process for the high-finish LED aluminum frame according to claim 1, characterized in that: in S7, the free acidity is 3 to 6 points.
5. The surface powder spraying pretreatment process for the high-finish LED aluminum frame according to claim 1, characterized in that: in S2, the acidic solution is one of potassium hydroxide, sodium bicarbonate, sodium hypophosphite, sodium carbonate, sulfuric acid, nitric acid, and sulfurous acid.
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