CN104674042A - Modification treatment of foamed aluminum foaming agent - Google Patents

Abstract

Chemical coated TiH2 is used as a foaming agent for preparing foamed aluminum, and TiH2 is made into the novel foaming agent by pretreatment and chemical nickel plating. An original TiH2 powder is compared with an Ni/TiH2 composite powder obtained after chemical nickel plating process, and a hydrogen release reaction starting temperature rises to 540 DEG C from 450 DEG C and is increased about 90 DEG C; and moreover, during the period of the temperature rising from room temperature to 700 DEG C, the total mass of the original TiH2 powder is decreased by 4.98%, while the total mass of the Ni/TiH2 composite powder is only decreased by 2.57%.

Description

The modification of foamed aluminium whipping agent

Technical field

The present invention relates to a kind of modification of whipping agent, especially a kind of modification of foamed aluminium whipping agent.

Background technology

Foamed aluminium is a kind of novel structure function integral material, has lightweight high rigidity and numerous good physical behavior, and at sound-absorbing damping, the fields such as damping shielding are widely used.Foam melt method is the common method of producing foamed aluminium.Due to molten aluminium temperature high (reaching 660 C), the too early too quick decomposition of whipping agent TiH2, causes the structural uniformity of foamed aluminium and controllability greatly to decline.

Summary of the invention

The present invention mainly adopts the mode of chemical nickel plating at TiH2 plated surface layer of metal nickel to reach the object making foaming agent foam agent delay to release hydrogen.Wherein, the main process of the modification of whipping agent is pre-treatment, chemical nickel plating, finished product detection.The present invention is realized by following steps:

A modification for foamed aluminium whipping agent, is characterized in that: the composition of this foamed aluminium whipping agent and component are TiH2 powder 10g, activation solution Palladous chloride: 0.4g/L-0.7 g/L, ammonium chloride: 0.9g/L-1.1 g/L, complexing agent EDTA:24 g/L-26 g/L, stablizer lead chloride: 0.4g/L-0.6 g/L, promotor toxilic acid: 45ml/L-55 g/L, buffer reagent sodium hydroxide: 30-55g/L, water (surplus).

Described activation solution is Palladous chloride (PdCl2).

Described complexing agent is EDTA (ethylenediamine tetraacetic acid (EDTA)).

Described stablizer is lead chloride (PbCl2).

Described promotor toxilic acid (HO2CCH=CHCO2H).

Described buffer reagent sodium hydroxide (NaOH).

Described treatment process comprises the following steps:

Pre-treatment:

A. the 100ml solution that Palladous chloride is concentration 0.4g/L-0.7 g/L is prepared;

B. add 0.3g ammonium chloride, and be diluted to 300ml solution;

C. 10g TiH2 powder is added in solution, use ultrasonic cleaning 20min;

D. washed with de-ionized water three times are used, to remove impurity after leaving standstill for a moment;

E. suction filtration is dry

Electroless plating:

A. solution is prepared by respective concentration:

Main salt single nickel salt: empirically technique

Complexing agent EDTA:24 g/L-26 g/L 100ml

Stablizer lead chloride: 0.4g/L-0.6 g/L 10ml

Promotor toxilic acid: 45ml/L-55 g/L 10ml

Buffer reagent sodium hydroxide: 30-55g/L 10ml

B. open constant water bath box, regulate required experimental temperature;

C. stirred and single nickel salt is joined in enveloping agent solution;

D. ammoniacal liquor is added, about regulating (3) solution pH value to 8;

E. while stirring successively, slowly stablizer, promotor, buffer reagent are joined in d solution;

F. use distilled water diluting solution to 250ml, with sodium hydroxide, solution is adjusted to required pH value;

G. add pretreated TiH2 powder, beaker is placed in constant water bath box, open magnetic agitation;

H. measuring the slow drainage of appropriate hydrazine hydrate solution enters in beaker;

I. react beginning, start timing;

J. every 10min detects a solution pH value, adjusts with sodium hydroxide if any during reduction;

K. react end, use washed with de-ionized water reaction solution, the liquid of falling dereaction after standing 10min;

L. remaining TiH2 powder is carried out suction filtration, dry;

M. constantly stir in implementation process.

Advantage of the present invention

After optimizing, the solution composition of chemical nickel plating is: reductive agent-hydrazine hydrate (N2H4H2O), main salt-single nickel salt

(NiSO46H2O), activation solution-Palladous chloride (PdCl2)+ammonium chloride (NH4Cl), complexing agent-ethylenediamine tetraacetic acid (EDTA) (EDTA), stablizer-lead chloride (PbCl2), buffer reagent-sodium hydroxide (NaOH), promotor-toxilic acid (HO2CCH=CHCO2H).Ni/TiH2 composite powder after original TiH2 powder and nickel chemical plating technology contrasts, and releases H-H reaction and starts temperature and rise to 540 C by 450 C, improve about 90 C; And from room temperature to the temperature raising period of 700 C, the Mass lost that original TiH2 powder is total 4.98%, and Ni/TiH2 composite powder only decreases 2.57%.

Embodiment

Embodiment 1:TiH2 powder 10g, activation solution Palladous chloride: 0.4g/L, ammonium chloride: 0.9g/L, complexing agent EDTA:24 g/L, stablizer lead chloride: 0.4g/L, promotor toxilic acid: 45ml/L, buffer reagent sodium hydroxide: 30, water (surplus).Pre-treatment:

A. the 100ml solution that Palladous chloride is concentration 0.4g/L is prepared;

B. add 0.3g ammonium chloride, and be diluted to 300ml solution;

C. 10g TiH2 powder is added in solution, use ultrasonic cleaning 20min;

D. washed with de-ionized water three times are used, to remove impurity after leaving standstill for a moment;

E. suction filtration is dry

Electroless plating:

A. solution is prepared by respective concentration:

Main salt single nickel salt: empirically technique

Complexing agent EDTA:24 g/L 100ml

Stablizer lead chloride: 0.4g/L 10ml

Promotor toxilic acid: 45ml/L 10ml

Buffer reagent sodium hydroxide: 30g/L 10ml

B. open constant water bath box, regulate required experimental temperature;

C. stirred and single nickel salt is joined in enveloping agent solution;

D. ammoniacal liquor is added, about regulating (3) solution pH value to 8;

E. while stirring successively, slowly stablizer, promotor, buffer reagent are joined in d solution;

F. use distilled water diluting solution to 250ml, with sodium hydroxide, solution is adjusted to required pH value;

G. add pretreated TiH2 powder, beaker is placed in constant water bath box, open magnetic agitation;

H. measuring the slow drainage of appropriate hydrazine hydrate solution enters in beaker;

I. react beginning, start timing;

J. every 10min detects a solution pH value, adjusts with sodium hydroxide if any during reduction;

K. react end, use washed with de-ionized water reaction solution, the liquid of falling dereaction after standing 10min;

L. remaining TiH2 powder is carried out suction filtration, dry;

M. constantly stir in experimentation.

 

Embodiment 2:TiH2 powder 10g, activation solution Palladous chloride: 0.7 g/L, ammonium chloride: 1.1 g/L, complexing agent EDTA:26 g/L, stablizer lead chloride: 0.6 g/L, promotor toxilic acid: 55 g/L, buffer reagent sodium hydroxide: 55g/L, water (surplus).

Pre-treatment:

A. the 100ml solution that Palladous chloride is concentration 0.7 g/L is prepared;

B. add 0.34g ammonium chloride, and be diluted to 300ml solution;

C. 10g TiH2 powder is added in solution, use ultrasonic cleaning 20min;

D. washed with de-ionized water three times are used, to remove impurity after leaving standstill for a moment;

E. suction filtration is dry

Electroless plating:

A. solution is prepared by respective concentration:

Main salt single nickel salt: empirically technique

Complexing agent EDTA:26 g/L 100ml

Stablizer lead chloride: 0.6 g/L 10ml

Promotor toxilic acid: 55 g/L 10ml

Buffer reagent sodium hydroxide: 55g/L 10ml

B. open constant water bath box, regulate required experimental temperature;

C. stirred and single nickel salt is joined in enveloping agent solution;

D. ammoniacal liquor is added, about regulating (3) solution pH value to 8;

E. while stirring successively, slowly stablizer, promotor, buffer reagent are joined in d solution;

F. use distilled water diluting solution to 250ml, with sodium hydroxide, solution is adjusted to required pH value;

G. add pretreated TiH2 powder, beaker is placed in constant water bath box, open magnetic agitation;

H. measuring the slow drainage of appropriate hydrazine hydrate solution enters in beaker;

I. react beginning, start timing;

J. every 10min detects a solution pH value, adjusts with sodium hydroxide if any during reduction;

K. react end, use washed with de-ionized water reaction solution, the liquid of falling dereaction after standing 10min;

L. remaining TiH2 powder is carried out suction filtration, dry;

M. constantly stir in experimentation.

Claims (7)

1. a modification for foamed aluminium whipping agent, is characterized in that: the composition of this foamed aluminium whipping agent and component are TiH2 powder 10g, activation solution Palladous chloride: 0.4g/L-0.7 g/L, ammonium chloride: 0.9g/L-1.1 g/L, complexing agent EDTA:24 g/L-26 g/L, stablizer lead chloride: 0.4g/L-0.6 g/L, promotor toxilic acid: 45ml/L-55 g/L, buffer reagent sodium hydroxide: 30-55g/L, water (surplus).

2. according to the modification of the foamed aluminium whipping agent described in claim 1, it is characterized in that, described activation solution is Palladous chloride (PdCl2).

3. according to the modification of the foamed aluminium whipping agent described in claim 1, it is characterized in that, described complexing agent is EDTA (ethylenediamine tetraacetic acid (EDTA)).

4. according to the modification of the foamed aluminium whipping agent described in claim 1, it is characterized in that, described stablizer is lead chloride (PbCl2).

5. according to the modification of the foamed aluminium whipping agent described in claim 1, it is characterized in that, described promotor toxilic acid (HO2CCH=CHCO2H).

6. according to the modification of the foamed aluminium whipping agent described in claim 1, it is characterized in that, described buffer reagent sodium hydroxide (NaOH).

7., according to the modification of the foamed aluminium whipping agent described in claim 1, it is characterized in that, treatment process comprises the following steps:

Pre-treatment:

A. the 100ml solution that Palladous chloride is concentration 0.4g/L-0.7 g/L is prepared;

B. add 0.3g ammonium chloride, and be diluted to 300ml solution;

C. 10g TiH2 powder is added in solution, use ultrasonic cleaning 20min;

D. washed with de-ionized water three times are used, to remove impurity after leaving standstill for a moment;

E. suction filtration is dry

Electroless plating:

A. solution is prepared by respective concentration:

Main salt single nickel salt: empirically technique

Complexing agent EDTA:24 g/L-26 g/L 100ml

Stablizer lead chloride: 0.4g/L-0.6 g/L 10ml

Promotor toxilic acid: 45ml/L-55 g/L 10ml

Buffer reagent sodium hydroxide: 30-55g/L 10ml

B. open constant water bath box, regulate required experimental temperature;

C. stirred and single nickel salt is joined in enveloping agent solution;

D. ammoniacal liquor is added, about regulating (3) solution pH value to 8;

E. while stirring successively, slowly stablizer, promotor, buffer reagent are joined in d solution;

F. use distilled water diluting solution to 250ml, with sodium hydroxide, solution is adjusted to required pH value;

G. add pretreated TiH2 powder, beaker is placed in constant water bath box, open magnetic agitation;

H. measuring the slow drainage of appropriate hydrazine hydrate solution enters in beaker;

I. react beginning, start timing;

J. every 10min detects a solution pH value, adjusts with sodium hydroxide if any during reduction;

K. react end, use washed with de-ionized water reaction solution, the liquid of falling dereaction after standing 10min;

L. remaining TiH2 powder is carried out suction filtration, dry;

M. constantly stir in implementation process.