SU910846A1 - Aqueous solution for passivation of berillium - Google Patents
Aqueous solution for passivation of berillium Download PDFInfo
- Publication number
- SU910846A1 SU910846A1 SU802962113A SU2962113A SU910846A1 SU 910846 A1 SU910846 A1 SU 910846A1 SU 802962113 A SU802962113 A SU 802962113A SU 2962113 A SU2962113 A SU 2962113A SU 910846 A1 SU910846 A1 SU 910846A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- passivation
- ammonium fluoride
- aqueous solution
- chromic sulphate
- solution
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
- C23C22/37—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also hexavalent chromium compounds
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Description
(54) ВОДНЫЙ РАСТВОР ДЛЯ ПАССИВАЦИИ (54) WATER SOLUTION FOR PASSIVATION
1 Изобретение относитс к получению защитных покрытий на металличес ких поверхност х, в частности к вод ным растворам дл пассивации берилли , и может быть использовано дл получени защитных пленок на сложно профилированных детал х. Известен раствор дл пассивации берилли , содержащий бихромат натри и плавиковую кислоту 1. Из данного раствора формируютс неравномерные пассивные пленки с цветами побежалости, имеющие недостаточную коррозионную стойкость. Наиболее близким по технической сущности и достигаемому результату вл етс раствор дл пассивации берилли , содержащий бихромат натри , фторид аммони и сернокислый хром. Из данного раствора на бериллии пол чают равномерные пассивные пленки толщиной ,700-1000 Д золотистого цве та 2 . Однако защитные свойства этих пленок также недостаточны, первые очаги коррозии по вл ютс на 22-е сутки. Цель изобретени - увеличение ко розионной стойкости покрыти . БЕРИЛЛИЯ Указанна цель достигаетс тем, что водный раствор дл пассивации берилли , содержащий бихромат натри , фторид аммони и сернокислый хром, дополнительно содержит винную и мо- лочную кислоты при следующем соотношении компонентов, вес.%: Бихромат натри 9-10 Фторид аммони 0,5-0,7 Сернокислый хром 1,0-1,5 Винна кислота3,0-5,0 Молочна кислота 3,0-5,0 ВодаОстальное Врем пассивации 5-10 мин, температура раствора 50-70°С Из предлагаемого раствора формируютс темно-коричневые окисные пленки толщиной 800-2000 А в зависимости от концентрации в растворе комплекса винной и молочной кислот. Пассивирующа способность предлагаемого и известного растворов приведена в табл. 1. Из результатов испытаний видно, что за оптимальную концентрацию комплекса органических кислот следует прин ть 3-5 вес.%.1 The invention relates to the production of protective coatings on metallic surfaces, in particular to aqueous solutions for the passivation of beryllium, and can be used to produce protective films on complexly shaped parts. A passivation solution of beryllium, containing sodium bichromate and hydrofluoric acid 1, is known. From this solution, non-uniform passive films with discolored colors with insufficient corrosion resistance are formed. The closest in technical essence and the achieved result is a solution for the passivation of beryllium containing sodium dichromate, ammonium fluoride and chromic sulphate. From this solution on beryllium, uniform passive films are obtained with a thickness of 700–1000 D of golden color 2. However, the protective properties of these films are also insufficient, the first corrosion centers appear on the 22nd day. The purpose of the invention is to increase the corrosion resistance of the coating. BERYLLIA The above objective is achieved in that the aqueous solution for passivating beryllium, containing sodium dichromate, ammonium fluoride and chromic sulphate, additionally contains tartaric and lactic acids in the following ratio of components, wt.%: Sodium dichromate 9-10 ammonium fluoride 0.5 -0.7 Chromic sulphate 1.0-1.5 Tartaric acid 3.0-5.0 Lactic acid 3.0-5.0 Water Else Passivation time 5-10 min, solution temperature 50-70 ° С From the proposed solution are formed dark Brown oxide films with a thickness of 800-2000 A, depending on the concentration in solution to Complex of tartaric and lactic acids. The passivating ability of the proposed and known solutions is given in Table. 1. From the test results it can be seen that the optimum concentration of the complex of organic acids should be 3-5 wt.%.
Коррозионные испытани пассивных пленок провели в 3%-ном растворе хлористого натри при переменном по гружении. Результаты испытаний приведены в табл. 2.Corrosion testing of passive films was carried out in a 3% solution of sodium chloride with alternating loading. The test results are shown in Table. 2
Из результатов испытаний видно, что из предлагаемого раствора получают более толстые и коррозионностойкие пассивные пленки, чем из известного .From the test results it can be seen that thicker and corrosion-resistant passive films are obtained from the proposed solution than from the known.
ТаблицаTable
ИзвестныйFamous
Бихромат натри 9Sodium bichromate 9
Фторид аммони 0,6 Ammonium fluoride 0.6
Сернокислый хром 1,0Chromium Sulphate 1.0
ПредлагаемыйProposed
Бихромат натри 9 , О Фтористый аммоний 0,6 Сернокислый хром 1,0 Винна кислота 3,0 Молочна кислота 3,0Sodium dichromate 9, o ammonium fluoride 0.6 chromic sulphate 1.0 tartaric acid 3.0 lactic acid 3.0
Бихромат натри 10 Фтористый аммоний 0,5 Сернокислый хром 1,5 Винна кислота 4,0 Молочна кислота 4,0Sodium dichromate 10 ammonium fluoride 0.5 chromic sulphate 1.5 tartaric acid 4.0 lactic acid 4.0
Осталь- Темно-ко- МеханичесТаблица2Ostal-Dark-co-Mechanical Table2
22 сут22 days
5050
После 90 сут испытаний очагов коррозии не обнаруженоAfter 90 days of testing, no foci of corrosion were found.
То жеAlso
5050
Бихромат натри 9,5 Фтористый аммоний 0,6 Сернокислый хром 1,0 Винный спирт 5,0 Молочна кислота 5,0Sodium bichromate 9.5 Ammonium fluoride 0.6 Chromic sulphate 1.0 Wine alcohol 5.0 Lactic acid 5.0
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU802962113A SU910846A1 (en) | 1980-07-16 | 1980-07-16 | Aqueous solution for passivation of berillium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU802962113A SU910846A1 (en) | 1980-07-16 | 1980-07-16 | Aqueous solution for passivation of berillium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU910846A1 true SU910846A1 (en) | 1982-03-07 |
Family
ID=20910438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU802962113A SU910846A1 (en) | 1980-07-16 | 1980-07-16 | Aqueous solution for passivation of berillium |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU910846A1 (en) |
-
1980
- 1980-07-16 SU SU802962113A patent/SU910846A1/en active
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