CN105986254B - A kind of rich silver-colored method and composition of high-speed chemical - Google Patents
A kind of rich silver-colored method and composition of high-speed chemical Download PDFInfo
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Abstract
The invention discloses a kind of rich silver method and composition of high-speed chemical, method includes acidic chemical oil removing, three washings, chemical microetch, three washings, preimpregnation, the preparation of Immersion Ag composition, Immersion Ag, three washings, air-dried, visual examination, packaging；The technology of the present invention can be in 13 minutes, silver layer of a layer thickness at least more than 1 micron is deposited on copper-based surface, meet " bonding " requirement, substitute that traditional hypertoxic cyanide is gold-plated, silver-plated technology, environmentally friendly, process stabilizing, it is easy to operate and of low cost, product after heavy silver is good compared to existing turmeric product illuminance, compared to the holder connection of electric silver, good heat dissipation effect.
Description
Technical field
The present invention relates to a kind of rich silver-colored method and compositions of high-speed chemical.
Background technology
Immersion Ag in the eighties with regard to existing application, easy to change and several due to easy ting produce Jia Fanni phenomenons etc.
It disappears, in recent years due to the needs of environmental protection, hot air leveling technology tends to be superseded, and heavy silver rises again, by continuously improving, mesh
Preceding heavy silver process has flatness good, and welding performance is excellent, simple for process, and it is many that easily controllable and flow is short, equipment is simple etc.
Advantage becomes the surface treatment prevailing technology of a new generation gradually.
In terms of related Immersion Ag, give to report there are many relevant patent document both at home and abroad, such as domestic patent：
CN1676673, CN100564594C, foreign patent：PatentNo：7479305；5733599；5173130；
WO2004007798A1；US20060165909；One common feature of above-mentioned patent is all the displacement using silver and copper itself
Reaction, i.e., after the copper on surface is replaced by silver, reaction stops, so thickness is unable to reach in actual production " bonding " to silver-colored thick
The requirement (silver is thick to be more than 1 micron) of degree, it is impossible to meet the applications for the LED field gradually risen at present.
Domestic and international patent is taken a broad view of, can meet the market demand in the application of surface soldered technology, but with
The development of green illumination, the demand rapid growth of the rise in the markets LED to " bonding ", and " bonding " technique mainly has two at present
Kind：The first, generally uses turmeric to be used as " bonding " technique, but there are following apparent defects：1. turmeric uses hypertoxic cyaniding
Object does a lot of damage to personnel and natural environment using with discharge of wastewater as raw material；2. the yellow surfaces in gold medal face are to light
The influence of illumination is big, causes luminous efficiency low；3. use gold to be used as BONGING carriers, it is expensive.
Second, using electric silver-colored " bonding " technique, in actual production, due to the thickness of silver layer need to reach 1 micron with
The upper production requirement for just enough meeting " bonding ", and the technology in existing patent sinks silver-colored thickness between 0.1-0.5 microns, no
It disclosure satisfy that " bonding " requirement.So at present in " bonding " field of LED, it is common to use then holder electricity silver again welds holder
The traditional handicraft being connected on wiring board, that is, use silver-colored " bonding " technology of electricity, but its it is apparent the disadvantage is that；1. still using severe toxicity
Cyanide causes damages to operating personnel and environment as raw material；One of holder manufacturing process more than 2. and again welding procedure, technique
Complexity, cost increase；3. the heat dissipation effect using holder technique is poor.
It, can be heavy on copper-based surface in 1-3 minutes it is therefore desirable to provide a kind of technology of the rich silver of high-speed chemical
Product silver layer of a layer thickness at least more than 1 micron, substitutes that traditional hypertoxic cyanide is gold-plated, silver-plated technology, environmentally friendly, work
Skill is stablized, easy to operate and of low cost, and the product after heavy silver is good compared to existing turmeric product illuminance, compared to electric silver
Holder connects, good heat dissipation effect.
Invention content
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of sides of the rich silver of high-speed chemical
Method and composition, this method can deposit silver of a layer thickness at least more than 1 micron in 0.5-3 minutes on copper-based surface
Layer meets " bonding " requirement, substitutes that traditional hypertoxic cyanide is gold-plated, silver-plated technology, environmentally friendly, process stabilizing, operation
Simple and of low cost, the product after heavy silver is good compared to existing turmeric product illuminance, and the holder compared to electric silver connects, and dissipates
Thermal effect is good.
In order to achieve the above object, this invention takes following technical schemes：A kind of rich silver-colored method of high-speed chemical, including
Following steps：The analytical pure sulfuric acid of 100ml 98% is added into the deionized water of 900ml, stirs for step S1, acidic chemical oil removing
10g citric acids are added after mixing uniformly, after being heated to 50 DEG C, the copper pad of aluminum substrate is put into solution and keeps 1min；Step S2,
Copper pad is taken out, is cleaned three times with deionized water；Step S3, the analysis that 30ml 98% is added into 900ml deionized waters are pure
Sulfuric acid stirs evenly, and after solution is cooled to 30 DEG C, is separately added into 50ml hydrogen peroxide and 20ml hydrogen peroxide stabilizers, stirring is equal
It is even, the copper pad finished will be cleaned in step S2 and is put into solution, and chemical microetch 1min is carried out；Step S4, by the copper after microetch
Weld pad takes out, and is cleaned three times with deionized water；Step S5, be separately added into the deionized water of 1000ml 32.5g pyrovinic acids,
10mg resorcinols, 11g reaction accelerators, 5mg methyl benzotriazazoles, 38g EDTA-Na4,0.1g FS-100, the poly- second of 1g
Glycol 200, stirs evenly, and adjusts solution acid value to 0.1-0.2N, solution is heated to 40-55 DEG C, after being cleaned in step S4
Copper pad be put into and keep 30s；Step S6 prepares the rich silver composition of high-speed chemical；Step S7 obtains above-mentioned steps S5
Copper pad be put into the rich silver composition of high speed that above-mentioned steps S6 is prepared and chemically reacted, keep rich silver composition
Temperature is 50-55 DEG C, reaction time 1-3min；Step S8 takes out the copper pad after reaction, is cleaned three times with deionized water,
It uses hot wind and cold wind to dry up respectively, checks appearance, be vacuum-packed.
The composition of the rich silver of chemistry for the rich silver-colored method of the high-speed chemical, preparation steps are as follows：A, under room temperature, to
0.5-20g silver iron compounds are added in the pure water of 500ml and form silver ion solution；B, to above-mentioned steps a silver ion solutions
The middle light inhibitor that 0.5-50mg is added, according to solution 1 after stirring evenly:Silver ion reaction accelerator, stirring is added in 1 molar ratio
Uniformly；C, be added into above-mentioned steps b mixed solutions has the inorganic of same functional group with the silver iron compound described in step a
Acid or organic acid, it is 0.2-1N to adjust its acid value；D sequentially adds the chelating agent of 5-50g into the mixed solution of above-mentioned steps c,
The benzotriazole compound of 0.5-50mg and the complexed surfactant of 5-20g, are adjusted after stirring evenly with deionized water
To 1000ml.
Further, the silver iron compound is inorganic silver compound or organic silver compound；Preferably, described inorganic
Silver compound is the compound of the one or more of silver nitrate, silver sulfate or silver carbonate；The organic silver compound is pyrovinic acid
Silver, silver benzoate, p-methyl benzenesulfonic acid silver, actol or silver acetate it is one or more of compound；Further, the Xanthophyll cycle
Agent is phenolic compound；Preferably, the phenolic compound is hydroquinone, catechol, resorcinol, 2,4- dimethyl benzenes
Phenol；Further, the inorganic acid is the compound of the one or more of nitric acid, sulfuric acid or carbonic acid；The organic acid is methyl sulphur
Acid, benzoic acid, p-methyl benzenesulfonic acid, lactic acid or acetic acid it is one or more of compound；Preferably, the accelerator is phenolsulfonic acid
Or the one or more of p-methyl benzenesulfonic acid is compound；Preferably, the chelating agent be EDTA, EDTA-NA2, EDTA-NA4, NTA,
DTPA, citric acid or trisodium citrate it is one or more of compound；Further, the complexed surfactant is fluorine surface
The compounding mixture of activating agent and polyethylene glycols activating agent.
The beneficial effects of the invention are as follows：The method of the present invention can deposit a thickness in 1-3 minutes on copper-based surface
Silver layer at least more than 1 micron is spent, " bonding " requirement is met, substitutes that traditional hypertoxic cyanide is gold-plated, silver-plated technology, to environment
Close friend, process stabilizing is easy to operate and of low cost, and the product after heavy silver is good compared to existing turmeric product illuminance, compares
In the holder connection of electric silver, good heat dissipation effect.
Description of the drawings
Fig. 1 is the pcb board comparison diagram after bare board and heavy silver.
Fig. 2 is the silver coating thickness test result figure impregnated 1 minute.
Fig. 3 is the analysis chart that surface composition analysis is carried out to product.
The heavy silver point brightness of pcb board is high after rich silver as seen from Figure 1, and effect is good；It can be obtained by Fig. 2, of the invention is heavy
Thick silver method is feasible, and silver coating thickness is more than 1 μm in 1 minute, and silver coating thickness increases with the increase in reaction time.
Specific implementation mode
The present invention provides a kind of rich silver-colored method and compositions of high-speed chemical.To make the purpose of the present invention, technical solution
And effect is clearer, clear, the present invention is described in more detail below, it should be understood that specific embodiment described herein
It is used only for explaining the present invention, be not intended to limit the present invention.
Embodiment one：It is formulated for the rich silver composition of chemistry of the rich silver-colored method of high-speed chemical, preparation steps are as follows：A,
Under room temperature, 0.5-20g silver iron compounds are added into the pure water of 500ml and form silver ion solution, silver iron compound choosing
With the one of which of silver nitrate, silver sulfate or silver carbonate；The light suppression of 0.5-50mg is added into above-mentioned steps a silver ion solutions by b
Preparation, according to solution 1 after stirring evenly:Silver ion reaction accelerator is added in 1 molar ratio, stirs evenly；Light inhibitor selection pair
Benzenediol, catechol, resorcinol, the one of which of 2,4- xylenols or in which several compound；Accelerator is selected
Phenolsulfonic acid or p-methyl benzenesulfonic acid one of which or two kinds it is compound；C is added and step a into the mixed solution of above-mentioned steps b
In silver iron compound have same functional group inorganic acid, adjust its acid value be 0.2-1N；If silver-ionized in step a
It closes object and selects silver nitrate, then the inorganic acid in this step selects nitric acid；If the silver iron compound in step a selects silver sulfate,
Then the inorganic acid in this step selects sulfuric acid；If the silver iron compound in step a selects silver carbonate, inorganic in this step
Acid selects carbonic acid；D sequentially adds the chelating agent of 5-50g, three nitrogen of benzo of 0.5-50mg into the mixed solution of above-mentioned steps c
The complexed surfactant of azole compounds and 5-20g, 1000ml is adjusted to after stirring evenly with deionized water.
Wherein, chelating agent selects EDTA, EDTA-NA2, EDTA-NA4, NTA, DTPA, citric acid or trisodium citrate wherein
One kind or in which several compound, with the lasting progress of reaction, the silver ion in solution can gradually decrease, and can pass through list
Solely addition silver ion is supplemented, since the copper ion displaced is constantly assembled in the solution, copper ion be in the solution with
Free state exists, the copper ion of free state can disturbing reaction speed, or even reversely be deposited in silver layer, influence silver layer appearance with
The solderability of welding is added the chelating agent that can capture copper ion, makes in solution in the solution in order to avoid the interference of copper ion
Copper ion become Chelating state, lose activity in the solution, avoid the interference to deposition of silver；The work of benzotriazole compound
With being to inhibit acid to the edge corrosion of Copper base material under the conditions of acid reaction.
Complexed surfactant is the compounding mixture of fluorinated surfactant and polyethylene glycols activating agent, wherein fluorine surface
The effect of activating agent be increase solution be deposited body surface permeability, improve silver ion deposition surface consistency,
The effect of polyethylene glycols surfactant be play the role of to each component in solution it is evenly dispersed.
After the completion of the rich silver composition of high-speed chemical is prepared, Immersion Ag operation is carried out, steps are as follows：Step S1, it is acid
The analytical pure sulfuric acid of 100ml 98% is added into the deionized water of 900ml for electrochemical deoiling, and 10g lemons are added after stirring evenly
Acid after being heated to 50 DEG C, the copper pad of aluminum substrate is put into solution and keeps 1min；Step S2, copper pad is taken out, spend from
Sub- water cleaning is three times；The analytical pure sulfuric acid of 30ml 98% is added into 900ml deionized waters, stirs evenly, waits for molten by step S3
After liquid is cooled to 30 DEG C, it is separately added into 50ml hydrogen peroxide and 20ml hydrogen peroxide stabilizers, is stirred evenly, will cleaned in step S2
Complete copper pad is put into solution, carries out chemical microetch 1min；Copper pad after microetch is taken out, uses deionized water by step S4
Cleaning is three times；It is anti-to be separately added into 32.5g pyrovinic acids, 10mg resorcinols, 11g into the deionized water of 1000ml by step S5
Accelerator, 5mg methyl benzotriazazoles, 38g EDTA-Na4,0.1g FS-100,1g polyethylene glycol 200s are answered, is stirred evenly, is adjusted
Solution acid value is saved to 0.1-0.2N, solution is heated to 40-55 DEG C, the copper pad after being cleaned in step S4 is put into and is kept
30s；Step S6 prepares the rich silver composition of high-speed chemical；The obtained copper pads of above-mentioned steps S5 are put into above-mentioned step by step S7
It is chemically reacted in the rich silver composition of high speed that rapid S6 is prepared, it is 50-55 DEG C to keep the temperature of rich silver composition, reaction
Time 1-3min；Step S8 is taken out the copper pad after reaction, is cleaned three times with deionized water, blown respectively using hot wind and cold wind
It is dry, it checks appearance, is vacuum-packed.
Embodiment two：The present embodiment is identical as the rich silver-colored step of the chemistry of embodiment one, the difference is that for chemistry
The composition of rich silver is different.
It is formulated for the rich silver composition of chemistry of the rich silver-colored method of high-speed chemical, preparation steps are as follows：A, under room temperature, to
0.5-20g silver iron compounds are added in the pure water of 500ml and form silver ion solution, silver iron compound selects pyrovinic acid
Silver, silver benzoate, p-methyl benzenesulfonic acid silver, actol or silver acetate are one such；B adds into above-mentioned steps a silver ion solutions
The light inhibitor for entering 0.5-50mg, according to solution 1 after stirring evenly:Silver ion reaction accelerator is added in 1 molar ratio, and stirring is equal
It is even；Light inhibitor selects hydroquinone, catechol, resorcinol, the one of which of 2,4- xylenols or in which several
It is compound；Accelerator selects the compound of phenolsulfonic acid or p-methyl benzenesulfonic acid one of which or two kinds.
C, be added into the mixed solution of above-mentioned steps b has same functional group with the silver iron compound in step a
Organic acid, it is 0.2-1N to adjust its acid value；If the silver iron compound in step a selects pyrovinic acid silver-colored, in this step
Organic acid selects pyrovinic acid；If the silver iron compound in step a selects sulphur silver benzoate, the inorganic acid choosing in this step
Use benzoic acid；If the silver iron compound in step a selects actol, the inorganic acid in this step selects lactic acid；If step a
In silver iron compound select silver acetate, then inorganic acid in this step selects acetic acid；D, to the mixed solution of above-mentioned steps c
In sequentially add the chelating agent of 5-50g, the benzotriazole compound of 0.5-50mg and the complexed surfactant of 5-20g,
After stirring evenly 1000ml is adjusted to deionized water.
Wherein, chelating agent selects EDTA, EDTA-NA2, EDTA-NA4, NTA, DTPA, citric acid or trisodium citrate wherein
One kind or in which several compound；Complexed surfactant is mixed for fluorinated surfactant and the compounding of polyethylene glycols activating agent
Close object.
Embodiment three：The present embodiment is identical as the rich silver-colored step of the chemistry of embodiment one, the difference is that for chemistry
The composition of rich silver is different.
It is formulated for the rich silver composition of chemistry of the rich silver-colored method of high-speed chemical, preparation steps are as follows：A, under room temperature, to
Addition 0.5-20g silver iron compounds composition silver ion solution in the pure water of 500ml, silver iron compound selection silver nitrate,
The two of which or whole progress of silver sulfate or silver carbonate are compound；0.5-50mg is added into above-mentioned steps a silver ion solutions in b
Light inhibitor, according to solution 1 after stirring evenly:Silver ion reaction accelerator is added in 1 molar ratio, stirs evenly；Light inhibitor
Select hydroquinone, catechol, resorcinol, the one of which of 2,4- xylenols or in which several compound；Accelerate
The compound of phenolsulfonic acid or p-methyl benzenesulfonic acid one of which or two kinds is selected in agent；C is added into the mixed solution of above-mentioned steps b
The organic acid with the silver iron compound in step a with same functional group, it is 0.2-1N to adjust its acid value；If in step a
Silver iron compound selects the compound of silver nitrate and silver sulfate, then organic acid in this step selects the compound of nitric acid and sulfuric acid
Object, and so on other several complex forms can be obtained；D sequentially adds 5-50g into the mixed solution of above-mentioned steps c
Chelating agent, the benzotriazole compound of 0.5-50mg and the complexed surfactant of 5-20g, spent after stirring evenly from
Sub- water is adjusted to 1000ml.
Wherein, chelating agent selects EDTA, EDTA-NA2, EDTA-NA4, NTA, DTPA, citric acid or trisodium citrate wherein
One kind or in which several compound；Complexed surfactant is mixed for fluorinated surfactant and the compounding of polyethylene glycols activating agent
Close object.
Example IV：The present embodiment is identical as the rich silver-colored step of the chemistry of embodiment one, the difference is that for chemistry
The composition of rich silver is different.
It is formulated for the rich silver composition of chemistry of the rich silver-colored method of high-speed chemical, preparation steps are as follows：A, under room temperature, to
0.5-20g silver iron compounds are added in the pure water of 500ml and form silver ion solution, silver iron compound selects pyrovinic acid
Silver, silver benzoate, p-methyl benzenesulfonic acid silver, actol or silver acetate wherein several all carry out compound；B, to above-mentioned steps a
The light inhibitor of 0.5-50mg is added in silver ion solution, according to solution 1 after stirring evenly:Silver ion reaction is added in 1 molar ratio
Accelerator stirs evenly；Wherein the one of light inhibitor selection hydroquinone, catechol, resorcinol, 2,4- xylenols
Kind or in which it is several compound；Accelerator selects the compound of phenolsulfonic acid or p-methyl benzenesulfonic acid one of which or two kinds；C, upwards
The organic acid for being added in the mixed solution of step b and there is same functional group with the silver iron compound in step a is stated, its acid is adjusted
Value is 0.2-1N；If the compound of silver iron compound selection the pyrovinic acid silver and silver benzoate in step a, in this step
Organic acid select pyrovinic acid and benzoic acid compound；If silver iron compound in step a select p-methyl benzenesulfonic acid silver,
The compound of actol and silver acetate, then organic acid in this step select the compound of p-methyl benzenesulfonic acid, lactic acid and acetic acid, with
This analogizes to obtain other several complex forms；D sequentially adds the chelating agent of 5-50g into the mixed solution of above-mentioned steps c,
The benzotriazole compound of 0.5-50mg and the complexed surfactant of 5-20g, are adjusted after stirring evenly with deionized water
To 1000ml.
Wherein, chelating agent selects EDTA, EDTA-NA2, EDTA-NA4, NTA, DTPA, citric acid or trisodium citrate wherein
One kind or in which several compound；Complexed surfactant is mixed for fluorinated surfactant and the compounding of polyethylene glycols activating agent
Close object.
The rich silver-colored method of high-speed chemical according to the present invention, chooses 15 finished product wiring boards and is divided into A, B, C, group, respectively to making
It is tested with " bonding " effect of the heavy silver process of invention solderability in the circuit board and aluminum substrate.
Wherein：A1, A2, A3, A4, A5 measure silver thickness, appearance, three times Reflow Soldering and three times Reflow Soldering under different soaking times
Solderability afterwards, test result are shown in (table 1).
B1, B2, B3, B4, B5 test 1.25mil Al wire bonding back pull, and test result is shown in (table 2).
C1, C2, C3, C4, C5 test the LED light data of 1.25mil Al wire bondings 5W, and test result is shown in (table 3).
(table 1)
(table 2)
(table 3)
Surface composition analysis is carried out to the silver layer epithelium for impregnating 30 seconds samples using EDX testers, analysis result is shown in Fig. 3
With table 4.
Table 4
One embodiment of the present invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as, it is noted that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Range is protected, therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. a kind of rich silver-colored method of high-speed chemical, it is characterised in that：Include the following steps：Step S1, acidic chemical oil removing, to
The analytical pure sulfuric acid of 100mL 98% is added in the deionized water of 900mL, 10g citric acids are added after stirring evenly, are heated to 50
After DEG C, the copper pad of aluminum substrate is put into solution and keeps 1min；Step S2, copper pad is taken out, and three are cleaned with deionized water
It is secondary；The analytical pure sulfuric acid of 30mL 98% is added into 900mL deionized waters, stirs evenly, waits for that solution is cooled to 30 by step S3
After DEG C, it is separately added into 50mL hydrogen peroxide and 20mL hydrogen peroxide stabilizers, is stirred evenly, the copper pad finished will be cleaned in step S2
It is put into solution, carries out chemical microetch 1min；Copper pad after microetch is taken out, is cleaned three times with deionized water by step S4；Step
Rapid S5 is separately added into 32.5g pyrovinic acids, 10mg resorcinols, 11g reaction accelerators, 5mg into the deionized water of 1000mL
Methyl benzotriazazole, 38g EDTA-Na4,0.1g FS-100,1g polyethylene glycol 200s, stir evenly, adjust solution acid value to
Solution is heated to 40-55 DEG C by 0.1-0.2N, and the copper pad after being cleaned in step S4 is put into and keeps 30s；Step S6, matches
The rich silver composition of high-speed chemical processed；The obtained copper pads of above-mentioned steps S5 are put into the height that above-mentioned steps S6 is prepared by step S7
It is chemically reacted in the rich silver composition of speed, it is 50-55 DEG C to keep the temperature of rich silver composition, reaction time 1-
3min；Step S8 takes out the copper pad after reaction, is cleaned three times with deionized water, uses hot wind and cold wind to dry up respectively, checks
Appearance is vacuum-packed.
2. a kind of composition of the rich silver of high-speed chemical, which is characterized in that preparation steps are as follows：A, under room temperature, to the pure of 500mL
0.5-20g silver iron compounds are added in water purification and form silver ion solution；0.5- is added into above-mentioned steps a silver ion solutions in b
The light inhibitor of 50mg, according to solution 1 after stirring evenly:Silver ion reaction accelerator is added in 1 molar ratio, stirs evenly；C, to
The inorganic acid that there is same functional group with the silver iron compound described in step a or organic is added in above-mentioned steps b mixed solutions
Acid, it is 0.2-1N to adjust its acid value；D sequentially adds the chelating agent of 5-50g, 0.5-50mg into the mixed solution of above-mentioned steps c
Benzotriazole compound and 5-20g complexed surfactant, be adjusted to 1000mL with deionized water after stirring evenly；
The accelerator is the compound of the one or more of phenolsulfonic acid or p-methyl benzenesulfonic acid；The complexed surfactant is fluorine surface
The compounding mixture of activating agent and polyethylene glycols activating agent.
3. a kind of composition of the rich silver of high-speed chemical according to claim 2, it is characterised in that：The silver ion chemical combination
Object is inorganic silver compound or organic silver compound.
4. a kind of composition of the rich silver of high-speed chemical according to claim 3, it is characterised in that：The inorganic silver chemical combination
Object is the compound of the one or more of silver nitrate, silver sulfate or silver carbonate；The organic silver compound is pyrovinic acid silver, benzene first
Sour silver, p-methyl benzenesulfonic acid silver, actol or silver acetate it is one or more of compound.
5. a kind of composition of the rich silver of high-speed chemical according to claim 2, it is characterised in that：The light inhibitor is
Phenolic compound.
6. a kind of composition of the rich silver of high-speed chemical according to claim 5, it is characterised in that：The phenolic compound
For hydroquinone, catechol, resorcinol, 2,4- xylenols.
7. a kind of composition of the rich silver of high-speed chemical according to claim 2, it is characterised in that：The inorganic acid is nitre
Acid, sulfuric acid or carbonic acid it is one or more of compound；The organic acid be pyrovinic acid, benzoic acid, p-methyl benzenesulfonic acid, lactic acid or
Acetic acid it is one or more of compound.
8. a kind of composition of the rich silver of high-speed chemical according to claim 2, it is characterised in that：The chelating agent is
EDTA, EDTA-NA2, EDTA-NA4, NTA, DTPA, citric acid or trisodium citrate it is one or more of compound.
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| Title |
|---|
| 化学沉银工艺的实践;梁继荣等;《表面涂覆》;20020630;第30-33页 * |
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| CN105986254A (en) | 2016-10-05 |
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