CN103215578A

CN103215578A - Metal passivant prepared from diosorea cirrhosa residue extracting liquid

Info

Publication number: CN103215578A
Application number: CN2013101016765A
Authority: CN
Inventors: 皮振邦; 李超
Original assignee: FOSHAN RESEARCH INSTITUTE CHINA UNIVERSITY OF GEOSCIENCES
Current assignee: FOSHAN RESEARCH INSTITUTE CHINA UNIVERSITY OF GEOSCIENCES
Priority date: 2013-03-27
Filing date: 2013-03-27
Publication date: 2013-07-24
Anticipated expiration: 2033-03-27
Also published as: CN103215578B

Abstract

The invention relates to a metal passivant prepared from diosorea cirrhosa residue extracting liquid. The metal passivant comprises the following components in parts by weight: 80 to 90 parts of diosorea cirrhosa extract, 2 to 5 parts of nitric acid, 5 to 10 parts of phosphoric acid salt and 2 to 5 part of accelerant, wherein the diosorea cirrhosa residue is waste residue after industrial utilization; the diosorea cirrhosa residue extracting liquid is a solution prepared by steps of mixing the diosorea cirrhosa residue and water according to a mass ratio of 1:(8-12) and heating at 40 to 60 DEG C for 2 to 4 hours; the accelerant is more than one of sodium molybdate, ammonium molybdate, zirconium oxide and zirconium nitrate; the phosphoric acid salt is more than one of disodium hydrogen phosphate, sodium dihydrogen phosphate and sodium phosphate; the passivant is adjusted by nitric acid and has a pH value of 3.0 to 6.0. Compared with the prior art, the metal passivant has the advantages of good passivation effect, high chemical stability of preparation and low cost.

Description

A kind of metal passivator that utilizes the preparation of dye yam slag extracting solution

Technical field

The present invention relates to a kind of metal passivator.

Background technology

In metal surface treatment process, passive film is modal chemical conversion film, and it mainly acts on is the Corrosion Protection that strengthens metal.Chromating agent for a long time is widely used with its excellent antiseptic property, but sexavalent chrome is poisonous, and serious pollution is caused to environment in the discharging back, and therefore the chrome-free tanning agent technology is widely studied in recent years.Chrome-free tanning agent mainly contains three classes at present, that is: inorganic salt passivator, organism passivator, organic and inorganic composite passivant.Inorganic passivator serves as main representative with molybdate, silicate, zirconates etc. mainly; Organic passivates serves as main representative with phytic acid, Weibull etc. mainly, and organic and inorganic composite passivant research at present is less, and silane coupling agent and molybdate series etc. are arranged; But also there are two deficiencies in the chrome-free tanning agent that occurs at present, the one, passivation effect is relatively poor, single inorganic or organic passivates passivation effect all can not satisfy industrial requirement, narrow range on probation, though organic and inorganic composite passivant inactivating performance excellence but passivator less stable, and cost is high, is difficult to promote.

Therefore, it is significant for the metal finishing industry to seek good, the with low cost passivator of a kind of inactivating performance.

Summary of the invention

Goal of the invention of the present invention is to provide a kind of good passivation effect, the preparation chemical stability is good, cost is low Utilize the metal passivator of dye yam slag extracting solution preparation

The passivator that provides is to be main component with dye yam slag extracting solution, by adding a spot of inorganic accelerator, adopts composite mode to prepare.The metal passivator of the present invention's preparation can be applicable to multiple metallic substance such as steel, galvanized steel, aluminium alloy, magnesium alloy.

The objective of the invention is to be achieved through the following technical solutions:

With listed as parts by weight, comprising:

Dye yam slag extract 80-90;

Nitric acid 2-5;

Phosphoric acid salt 5-10;

Promotor 2-5;

Described dye yam slag is the waste residue behind the industrial utilization;

Described dye yam slag extracting solution mixes solution that back 40-60 ℃ heating 2-4 hour obtain with water according to mass ratio 1:8-12 for utilizing the dye yam slag;

Described promotor is more than one in Sodium orthomolybdate, ammonium molybdate, zirconium white, the zirconium nitrate;

Described phosphoric acid salt is more than one in Sodium phosphate dibasic, SODIUM PHOSPHATE, MONOBASIC, the sodium phosphate;

Described passivator is regulated pH value 3.0 ~ 6.0 with nitric acid acid.

The present invention can reach following beneficial effect after adopting such scheme:

1, inactivating performance is good.The present invention is that employing dye yam slag extracting solution is that main component prepares metal passivator, on the one hand owing to contain great deal of tannin acid in the dye yam slag, and Weibull can react with the metallic surface ion and forms the netted protective membrane of one deck, add a spot of promotor on the other hand, promotor and metal ion effect are filled up in the reticular protection film space, make protective membrane fine and close more, even, Corrosion Protection is stronger;

2, energy-conservation.Because the present invention is that employing dye yam slag extracting solution is a main component, in the dye yam slag extracting solution a large amount of surfactants is arranged, these surfactants have effectively reduced the surface tension of solution, make the passivating solution that remains in steel surface in the extremely short time, to come off, can reduce water for cleaning in the metal finishing process;

3, environmental protection.The present invention is the feedstock production metal passivator with trade waste dye yam slag, belongs to the resource circulation utilization field, and product is nontoxic, and the metal products after transpassivation satisfies the RoHS of European Union standard;

4, cost is low.This product is raw material production with the industrial waste, and preparation technology is simple, and product cost is low, and economic benefit is very considerable.

Embodiment

Below in conjunction with specific examples the present invention is described in further detail:

Embodiment 1

At normal temperatures and pressures, take by weighing certain dye yam slag industrial waste, add pure water, join process furnace internal heating to 50 ℃ after stirring according to the ratio of the 1:10 of mass percent, keep 3h after, filtering separation obtains dye yam slag extracting solution;

With the dye yam slag extracting solution of 80 weight parts, the nitric acid of 2 weight parts, the 5-weight part phosphoric acid salt, 2 weight parts promotor mix to stir 5-10 minute, be prepared into metal passivator;

Described phosphoric acid salt is Sodium phosphate dibasic; Described promotor is Sodium orthomolybdate, and regulating the pH value is 4.0.

The passivator for preparing can adopt the mode of soaking or spraying that metal products is carried out passivation.Metal products obtains good passivation layer after handling through this preparation.

Embodiment 2

At normal temperatures and pressures, take by weighing certain dye yam slag industrial waste, add pure water, join process furnace internal heating to 40 ℃ after stirring according to the ratio of the 1:8 of mass percent, keep 4h after, filtering separation obtains dye yam slag extracting solution;

With the dye yam slag extracting solution of 85 weight parts, the nitric acid of 5 weight parts, 5 weight parts phosphoric acid salt, 5 weight parts promotor mix to stir 5-10 minute, be prepared into metal passivator;

Described phosphoric acid salt is Sodium phosphate dibasic; Described promotor is water glass, and regulating the pH value is 3.0.

Embodiment 3

At normal temperatures and pressures, take by weighing certain dye yam slag industrial waste, add pure water, join process furnace internal heating to 60 ℃ after stirring according to the ratio of the 1:12 of mass percent, keep 2h after, filtering separation obtains dye yam slag extracting solution;

With the dye yam slag extracting solution of 87 weight parts, the nitric acid of 4 weight parts, 5 weight parts phosphoric acid salt, 4 weight parts promotor mix to stir 10 minutes, be prepared into metal passivator;

Described phosphoric acid salt is Sodium phosphate dibasic; Described promotor is water glass, and regulating the pH value is 6.0.

Embodiment 4

At normal temperatures and pressures, take by weighing certain dye yam slag industrial waste, add pure water, join process furnace internal heating to 50 ℃ after stirring according to the ratio of the 1:11 of mass percent, keep 3h after, filtering separation obtains dye yam slag extracting solution;

With the dye yam slag extracting solution of 90 weight parts, the nitric acid of 2 weight parts, 5 weight parts phosphoric acid salt, 3 weight parts promotor mix to stir 10 minutes, be prepared into metal passivator;

Described phosphoric acid salt is Sodium phosphate dibasic; Described promotor is water glass, and regulating the pH value is 5.0.

Claims

1. metal passivator that utilizes dye yam slag extracting solution preparation is characterized in that: with listed as parts by weight, comprising:

Dye yam slag extract 80-90;

Nitric acid 2-5;

Phosphoric acid salt 5-10;

Promotor 2-5;

Described passivator is regulated pH value 3.0 ~ 6.0 with nitric acid acid.

2. a kind of metal passivator that utilizes the preparation of dye yam slag extract according to claim 1 is characterized in that described dye yam slag is the waste residue behind the industrial utilization.

3. a kind of metal passivator that utilizes the preparation of dye yam slag extracting solution according to claim 1 and 2 is characterized in that: described dye yam slag extracting solution is to utilize the dye yam slag to mix the solution that the back obtained 50 ℃ of heating in 3 hours with water according to mass percent 1:10.