CN108103487A - A kind of zinc-plated silicate passivation solution and preparation method thereof - Google Patents

Abstract

The present invention provides a kind of zinc-plated silicate passivation solution and preparation method thereof, is related to galvanizing surface processing technology field, and the passivating solution component includes following raw material：40 50g/L of non-hydrate sodium metasilicate, 95% 98% 3 5mL/L of the concentrated sulfuric acid, 30% hydrogen peroxide, 6 15mL/L, 65% 68% 2 5mL/L of concentrated nitric acid, five water cerous nitrates, 4 10g/L, remaining is distilled water, and overall solution volume 1L, the pH value for being passivated system is 12.Preparation process of the present invention is simple.Passivating solution film forming glossiness is good, and surface is uniform, has good corrosion resistance.Present invention ingredient used in passivating solution is inorganic matter, without any valence state chromium and noxious material, overcomes the shortcomings of chromating technology toxicity is big, to environment generation destruction；Instant component is cheap, beneficial to production and promotes.

Description

A kind of zinc-plated silicate passivation solution and preparation method thereof

Technical field

The present invention relates to a kind of material surface preservative treatment technology fields, and in particular to a kind of zinc-plated silicate passivation solution and Its preparation method.

Background technology

The zinc-plated corrosion resistance that can effectively improve steel plate, is widely used in building materials field, but in wet environment Middle zinc coat easily occurs corrosion and forms dark gray or white corrosion product, and antiseptic property is caused to decline.It must carry out therefore Passivation Treatment.Chromic acid passivation agent used currently on the market, effect is good, but pollution is larger, with the strengthening of people's awareness of environmental protection, Chromium-free deactivation will gradually occupy whole market, and silicate passivation has stronger competitiveness.

The content of the invention

In view of the deficiencies of the prior art, the present invention provides a kind of zinc-plated silicate passivation solution and preparation method thereof, costs It is cheap, it is environmentally safe, while there is good corrosion resistance.

In order to achieve the above object, the present invention is achieved by the following technical programs：

A kind of zinc-plated silicate passivation solution, for the Passivation Treatment of zinc coat parts, is made of following raw material：Nine water are inclined Sodium metasilicate 40-50g/L, 95%-98% concentrated sulfuric acid 3-5mL/L, 30% hydrogen peroxide 6-15mL/L, 65%-68% concentrated nitric acid 2- 5mL/L, five water cerous nitrate 4-10g/L, remaining be distilled water, overall solution volume 1L, be passivated system pH value be 1-2.

Wherein, non-hydrate sodium metasilicate is powdered.

Preferably, zinc-plated silicate passivation solution, is made of following raw material：Non-hydrate sodium metasilicate 45g/L, 95%-98% is dense Sulfuric acid 5mL/L, 30% hydrogen peroxide 10mL/L, 65%-68% concentrated nitric acid 2mL/L, five water cerous nitrate 8g/L, remaining is distilled water, Overall solution volume is 1L, the pH=1.4 of passivating solution.

A kind of preparation method of zinc-plated silicate passivation solution, comprises the following steps：

(1) at room temperature, by non-hydrate sodium metasilicate high speed Universal pulverizer, 20000-25000 revs/min, 3-6 points are crushed Clock breaks into powder, takes the sodium metasilicate powder after crushing, is dissolved in distilled water, and it is made fully to dissolve；

(2) concentrated sulfuric acid, hydrogen peroxide and concentrated nitric acid are added in into step (1) successively, is stirred evenly；

(3) 65%-68% concentrated nitric acids are configured to the salpeter solution of 3%-5%, for adjusting the pH value of solution to 1-2；

(4) five water cerous nitrates are added in and stirs in step (3) and fully dissolve, silicate passivation solution is made.

Compared with prior art, the present invention it has the following advantages：(1) corrosion resisting property of the present invention is excellent, rotten through neutral salt spray Corrosion test compares, and occurs corrosion pit for 24 hours after the preferable chromating of business application at present, and through blunt prepared by the present invention There is the time lengthening of white rust to 94h after changing liquid processing；(2) non-hydrate sodium metasilicate that uses of the present invention is as main component, together When non-hydrate sodium metasilicate is crushed with high speed Universal pulverizer, the dissolubility of nine water metasilicates, Jin Erti can be significantly improved High film forming efficiency so that surface is uniform；(3) present invention ingredient used in passivating solution is inorganic matter, without any valence state chromium and Noxious material overcomes the shortcomings of chromating technology toxicity is big, to environment generation destruction；(4) cerium salt is that one kind is appraised at the current rate gold Belong to, can store and discharge electronics, form different oxides, commonly used under alkaline condition, the present invention is using cerous nitrate to mix Carnallite as the component modifier of passivating solution, has played important function in acid system.(5) instant component is cheap, is beneficial to Production and popularization.

Specific embodiment

The essence of the present invention is described further with reference to embodiment.

Embodiment 1：

Zinc-plated silicate passivation solution, is made of following raw material：Non-hydrate sodium metasilicate 50.0g/L, the nine water metasilicic acids Sodium is powdered, 95%-98% concentrated sulfuric acids 5.0mL/L, 30% hydrogen peroxide 6.0mL/L, 65%-68% concentrated nitric acid 2.0mL/L, nitre Sour cerium 10.0g/L, remaining is distilled water, and overall solution volume 1L, the pH value for being passivated system is 1.0.

Its preparation method is：At room temperature, by non-hydrate sodium metasilicate with high speed Universal pulverizer (FW-200D), 20000 turns/ Divide -25000 revs/min, crush 3 minutes, break into powder, take the non-hydrate sodium metasilicate powder after 50g crushing, be dissolved in 1L distilled water In, and it is made fully to dissolve；The 5.0mL concentrated sulfuric acids, 6.0mL hydrogen peroxide are added in into sodium silicate solution successively, 2.0mL concentrated nitric acids stir It mixes uniformly；The salpeter solution that 65%-68% concentrated nitric acids are configured to 3% afterwards is used to adjust the pH value of solution as 1.0；It adds Five water cerous nitrates of 10g are stirred and fully dissolved, and silicate passivation solution is made.

The non-hydrate sodium metasilicate is industrial goods, and the concentrated sulfuric acid, hydrogen peroxide, concentrated nitric acid, five water cerous nitrates are commercially availableization Learn net product.

It is 20 μm of galvanized steel Q235 by zinc coating thickness, 30s, distilled water flushing 1min is activated with 3% nitric acid, in 35 DEG C of items Under part, by after activation galvanized sheet immerse passivating solution in 90s, drying at room temperature for 24 hours after, carry out neutral salt spray test.

Salt mist experiment result is referring to table 1.

Embodiment 2：

Zinc-plated silicate passivation solution, is made of following raw material：Nine water sodium metasilicate 40.0g/L, the non-hydrate sodium metasilicate To be powdered, 95%-98% concentrated sulfuric acids 3.0mL/L, 30% hydrogen peroxide 10.0mL/L, 65%-68% concentrated nitric acid 5.0mL/L, five Water cerous nitrate 4.0g/L, remaining is distilled water, and overall solution volume 1L, the pH value for being passivated system is 1.5.

Its preparation method is:At room temperature, by sodium metasilicate with high speed Universal pulverizer (FW-200D), 20000 revs/min, crush 6 minutes, powder is broken into, the sodium metasilicate powder after 40g crushing is taken, is dissolved in 1L distilled water, and it is made fully to dissolve；Successively to silicon The 3.0mL concentrated sulfuric acids, 10.0mL hydrogen peroxide are added in acid sodium solution, 5.0mL concentrated nitric acids stir evenly；It is adjusted afterwards with 3% nitric acid The pH value of solution is 1.5；It adds 4.0g cerous nitrates to stir and fully dissolve, silicate passivation solution is made.

The non-hydrate sodium metasilicate is industrial goods, and the concentrated sulfuric acid, hydrogen peroxide, concentrated nitric acid, cerous nitrate are that commercially available chemistry is pure Product.

It is 20 μm of galvanized steel Q235 by zinc coating thickness, 30s, distilled water flushing 1min is activated with 3% nitric acid, in 35 DEG C of items Under part, by after activation galvanized sheet immerse passivating solution in 90s, drying at room temperature for 24 hours after, carry out neutral salt spray test.

Salt mist experiment result is referring to table 1.

Embodiment 3：

Zinc-plated silicate passivation solution, is made of following raw material：Non-hydrate sodium metasilicate 45g/L, the non-hydrate sodium metasilicate To be powdered, 95%-98% concentrated sulfuric acids 5mL/L, 30% hydrogen peroxide 10mL/L, 65%-68% concentrated nitric acid 2mL/L, five water nitric acid Cerium 8g/L, remaining is distilled water, overall solution volume 1L, the pH=1.4 of passivating solution.

Its preparation method is:At room temperature, by non-hydrate sodium metasilicate with high speed Universal pulverizer (FW-200D), 25000 turns/ Point, it crushes 3 minutes, breaks into powder, take the sodium metasilicate powder after 45g crushing, be dissolved in 1L distilled water, and it is made fully to dissolve； The 5.0mL concentrated sulfuric acids, 10.0mL hydrogen peroxide are added in into sodium silicate solution successively, 2.0mL concentrated nitric acids stir evenly；Afterwards with 3% The pH value that concentrated nitric acid adjusts solution is 1.4；It adds five water cerous nitrates of 8.0g to stir and fully dissolve, silicate passivation is made Liquid.

The non-hydrate sodium metasilicate is industrial goods, and the concentrated sulfuric acid, hydrogen peroxide, concentrated nitric acid, cerous nitrate are that commercially available chemistry is pure Product.

It is 20 μm of galvanized steel Q235 by zinc coating thickness, 30s, distilled water flushing 1min is activated with 3% nitric acid, in 35 DEG C of items Under part, by after activation galvanized sheet immerse passivating solution in 90s, drying at room temperature for 24 hours after, carry out neutral salt spray test.

Salt mist experiment result is referring to table 1.

1 salt mist experiment result of table

Claims (4)

1. a kind of zinc-plated silicate passivation solution, it is characterised in that：It is made of following raw material：Non-hydrate sodium metasilicate 40-50g/L, 95%-98% concentrated sulfuric acids 3-5mL/L, 30% hydrogen peroxide 6-15mL/L, 65%-68% concentrated nitric acid 2-5mL/L, five water cerous nitrate 4- 10g/L, remaining be distilled water, overall solution volume 1L, be passivated system pH value be 1-2.

2. zinc-plated silicate passivation solution as described in claim 1, it is characterised in that：The non-hydrate sodium metasilicate is powder Shape.

3. zinc-plated silicate passivation solution as claimed in claim 2, it is characterised in that：It is made of following raw material：Nine water metasilicic acids Sodium 45g/L, 95%-98% concentrated sulfuric acid 5mL/L, 30% hydrogen peroxide 10mL/L, 65%-68% concentrated nitric acid 2mL/L, five water cerous nitrates 8g/L, remaining is distilled water, overall solution volume 1L, the pH=1.4 of passivating solution.

4. such as a kind of preparation method of zinc-plated silicate passivation solution of claim 1-3 any one of them, it is characterised in that：Including Following steps：

(1) at room temperature, by non-hydrate sodium metasilicate high speed Universal pulverizer, 20000 revs/min -25000 revs/min, 3-6 points are crushed Zhong Houcheng is powdered, and the non-hydrate sodium metasilicate powder after crushing is taken to be dissolved in a certain amount of distilled water, and it is made fully to dissolve；

(2) concentrated sulfuric acid, hydrogen peroxide and concentrated nitric acid are added in into step (1) successively, is stirred evenly；

(3) pH value of 3%-5% salpeter solutions adjusting solution is configured to the concentrated nitric acid of 65%-68%；

(4) cerous nitrate is added in and stirs in step (3) and fully dissolve, silicate passivation solution is made.