FIELD: chemistry.
SUBSTANCE: method involves oxidising articles made from aluminium and alloys thereof in acidic solutions for 30-50 minutes, further holding in boiling aqueous sodium hydroxide solution with concentration of 0.2-0.4 g/l for 40-50 minutes and then heating. The solvent used in acidic solutions is deionsed water and subsequent heating is carried out in three steps. First, the articles are heated to 260-270°C and held for 3-5 minutes, then heated to 460-470°C and held for 3-5 minutes and then heated to 530-545°C and held for 8-15 minutes.
EFFECT: larger thickness of coatings, high electrical resistance thereof, high corrosion resistance thereof in neutral and acidic media, shorter duration of holding coated articles when heating.
1 tbl, 1 ex, 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| PRODUCTION OF COATINGS | 2013 |
|
RU2527107C1 |
| METHOD FOR PRODUCTION OF COATINGS | 2007 |
|
RU2354759C1 |
| METHOD OF COATING OBTAINMENT | 2007 |
|
RU2354758C2 |
| PROCEDURE FOR APPLICATION OF COATING | 2009 |
|
RU2395633C1 |
| PROCEDURE FOR APPLYING COATING | 2009 |
|
RU2393274C1 |
| PROCEDURE FOR APPLICATION OF COATING | 2009 |
|
RU2395632C1 |
| METHOD OF PRODUCING COATINGS ON SURFACES OF DEEP THROUGH HOLES WITH STRAIGHT AND CURVED AXES IN ARTICLES FROM VALVE METAL ALLOYS | 2018 |
|
RU2694859C1 |
| METHOD OF OBTAINING CERAMIC COATINGS ON DETAILS FROM STEELS | 2016 |
|
RU2622073C1 |
| METHOD OF PRODUCING COATINGS ON SURFACES OF THROUGH HOLES IN PRODUCTS FROM VALVE METAL ALLOYS | 2017 |
|
RU2669952C1 |
| METHOD FOR MAKING COATINGS ON SURFACES OF INTERNAL CAVITIES OF PRODUCTS FROM ALLOYS OF VALVE GROUP METALS | 2022 |
|
RU2803795C1 |
