CN103469193A - Formula of forming pickling passivation solution for surface oxide film of stainless steel casting - Google Patents
Formula of forming pickling passivation solution for surface oxide film of stainless steel casting Download PDFInfo
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- CN103469193A CN103469193A CN2013103720705A CN201310372070A CN103469193A CN 103469193 A CN103469193 A CN 103469193A CN 2013103720705 A CN2013103720705 A CN 2013103720705A CN 201310372070 A CN201310372070 A CN 201310372070A CN 103469193 A CN103469193 A CN 103469193A
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Abstract
The invention discloses a formula of forming pickling passivation solution for a surface oxide film of a stainless steel casting. The forming pickling passivation solution is prepared at a temperature of 40 to 46 DEG C from the following ingredients in part by weight (per litre): 40ml of nitric acid with concentration of 70 percent, 200ml of hydrochloric acid with concentration of 30 percent, 200ml of hydrofluoric acid with concentration of 30 percent and 200ml of water. The formula of the forming pickling passivation solution for the surface oxide film of the stainless steel casting, which is disclosed by the invention, has strong corrosion removal performance, enables a layer of compact oxide film to be formed on the surface of the stainless steel casting and improves corrosion resistance of the stainless steel casting.
Description
Technical field
The present invention relates to the stainless cast steel part field of surface treatment, specifically a kind of stainless cast steel part surface film oxide shaping acid wash passivation liquid formula.
Background technology
Under the condition of market economy, customer need is constantly to change and improve, concerning present valve industry,, the requirement of user to valve, the internal soundness that not only will have, the corrosion resistance on surface requires also very high, and the passive film of stainless steel surface is to its corrosion-resistant having a significant impact.Stainless cast steel part in use, in order to reduce and to delay rust corrosion speed, need to form a kind of fine and close oxide protective layer at cast(ing) surface, thereby reach the effect of protection.For guaranteeing the effect of Passivation Treatment, before passivation, first to being passivated surface, carry out cleanup acid treatment.Whole treating processes just is called acid wash passivation to be processed, and cylinder claims acid wash passivation.When general stainless valve foundry goods is heat-treated, all in oxidizing atmosphere, carry out, make the poor chromium of upper layer reduce its solidity to corrosion, so will carry out pickling, remove this poor chromium layer.The quality of precision castings pickling quality is relevant with the erosion resistance of alloying element, also depends in addition the corrosion removing ability of pickle solution to foundry goods oxide skin.Existing acid wash passivation liquid, it is general that performance is removed in its corrosion, can not get user's demand.
Summary of the invention
In order to solve the above-mentioned technical problem existed in prior art, the invention provides a kind of stainless cast steel part surface film oxide shaping acid wash passivation liquid formula, one-tenth assignment system (in every liter) by following parts by weight: 70% nitric acid of 400 milliliters, 30% hydrochloric acid of 200 milliliters, 30% hydrofluoric acid of 200 milliliters and the water of 200 milliliters, obtain in a temperature 40-46 ℃ preparation.
The present invention also provides a kind of stainless cast steel part surface film oxide forming technology, comprises the steps:
One. water cleans stainless cast steel part;
Two. with the described stainless cast steel part of above-mentioned acid wash passivation liquid cleanup acid treatment;
Three. water cleans described stainless cast steel part;
Four. with the described stainless cast steel part of above-mentioned acid wash passivation liquid acid Passivation Treatment;
Five. water cleans described stainless cast steel part.
It is strong that performance is removed in stainless cast steel part surface film oxide shaping acid wash passivation liquid formula corrosion of the present invention, makes the oxide film of stainless cast steel part surface formation one deck densification, improves the resistance to corrosion of stainless cast steel part.
Embodiment
Below the invention will be further described.
Stainless cast steel part surface film oxide shaping acid wash passivation liquid formula of the present invention, one-tenth assignment system (in every liter) by following parts by weight: 70% nitric acid of 400 milliliters, 30% hydrochloric acid of 200 milliliters, 30% hydrofluoric acid of 200 milliliters and the water of 200 milliliters, obtain in a temperature 40-46 ℃ preparation.
Stainless cast steel part surface film oxide forming technology flow process of the present invention is as follows:
Six. water cleans stainless cast steel part;
Seven. by above-mentioned acid wash passivation liquid cleanup acid treatment;
Eight. water cleans stainless cast steel part;
Nine. by above-mentioned acid wash passivation liquid Passivation Treatment;
Ten. water cleans stainless cast steel part.
The above is only the preferred embodiment of the present invention.It should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from principle of the present invention, can also make some modification and improvement, these also should be considered as belonging to protection scope of the present invention.
Claims (2)
1. a stainless cast steel part surface film oxide shaping acid wash passivation liquid formula, one-tenth assignment system (in every liter) by following parts by weight: 70% nitric acid of 400 milliliters, 30% hydrochloric acid of 200 milliliters, 30% hydrofluoric acid of 200 milliliters and the water of 200 milliliters, obtain in a temperature 40-46 ℃ preparation.
2. a stainless cast steel part surface film oxide forming technology, comprise the steps:
One. water cleans stainless cast steel part;
Two. with the described stainless cast steel part of acid wash passivation liquid cleanup acid treatment claimed in claim 1;
Three. water cleans described stainless cast steel part;
Four. with the described stainless cast steel part of acid wash passivation liquid acid Passivation Treatment claimed in claim 1;
Five. water cleans described stainless cast steel part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103720705A CN103469193A (en) | 2013-08-23 | 2013-08-23 | Formula of forming pickling passivation solution for surface oxide film of stainless steel casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103720705A CN103469193A (en) | 2013-08-23 | 2013-08-23 | Formula of forming pickling passivation solution for surface oxide film of stainless steel casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103469193A true CN103469193A (en) | 2013-12-25 |
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| CN2013103720705A Pending CN103469193A (en) | 2013-08-23 | 2013-08-23 | Formula of forming pickling passivation solution for surface oxide film of stainless steel casting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104476141A (en) * | 2014-12-22 | 2015-04-01 | 青岛锻艺金属有限公司 | Door window welding process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002012592A1 (en) * | 2000-08-07 | 2002-02-14 | Ati Properties, Inc. | Surface treatments to improve corrosion resistance of austenitic stainless steels |
| CN1084368C (en) * | 1999-04-09 | 2002-05-08 | 陕西省户县眉坞化工厂 | Chemical polishing agent and its application method |
| WO2008058986A1 (en) * | 2006-11-14 | 2008-05-22 | Danieli & C. Officine Meccaniche S.P.A. | Annealing and pickling process |
| CN102181874A (en) * | 2011-03-31 | 2011-09-14 | 山西太钢不锈钢股份有限公司 | Acid-washing method of stainless steel wire for welding |
| CN103100562A (en) * | 2011-11-09 | 2013-05-15 | 宁波宝新不锈钢有限公司 | Method of machining special passivated stainless steel surface |
-
2013
- 2013-08-23 CN CN2013103720705A patent/CN103469193A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084368C (en) * | 1999-04-09 | 2002-05-08 | 陕西省户县眉坞化工厂 | Chemical polishing agent and its application method |
| WO2002012592A1 (en) * | 2000-08-07 | 2002-02-14 | Ati Properties, Inc. | Surface treatments to improve corrosion resistance of austenitic stainless steels |
| WO2008058986A1 (en) * | 2006-11-14 | 2008-05-22 | Danieli & C. Officine Meccaniche S.P.A. | Annealing and pickling process |
| CN102181874A (en) * | 2011-03-31 | 2011-09-14 | 山西太钢不锈钢股份有限公司 | Acid-washing method of stainless steel wire for welding |
| CN103100562A (en) * | 2011-11-09 | 2013-05-15 | 宁波宝新不锈钢有限公司 | Method of machining special passivated stainless steel surface |
Non-Patent Citations (3)
| Title |
|---|
| 宋健雄: "《实用电工问答》", 31 January 2006 * |
| 王毓民 等: "《金属加工过程中的清洗与防锈》", 31 January 2009 * |
| 胡顺生: "奥氏体不锈钢酸洗钝化新工艺研究", 《化工设计通讯》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104476141A (en) * | 2014-12-22 | 2015-04-01 | 青岛锻艺金属有限公司 | Door window welding process |
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Application publication date: 20131225 |