FIELD: chemistry.
SUBSTANCE: group of inventions relates to an aqueous composition for etching a metal base, methods for etching a metal base and applying a coating on a metal base. Aqueous composition for etching a metal base has a pH value at temperature of 55 °C in range of 5–9 and contains at least two different derivatives of aminoorganophosphonic acid of formula (I)
in which residues R independently represent CH2-PO(OR'')2, residues R' independently represent alkylene residues with 2–4 carbon atoms, residues R'' independently represent H, Na, K, Li or NH4 and n is integer from 0 to 4, and wherein at least two different derivatives of aminoorganophosphonic acid differ by value of n.
EFFECT: invention provides balanced etching of different metal substrates without breaking adhesion of subsequent coating layers.
18 cl, 8 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| PHOSPHATE-FREE CLEANING AGENT FOR METAL SURFACES PROVIDING REDUCED EROSION DURING ETCHING | 2020 |
|
RU2815091C2 |
| METHOD OF COATING METAL SURFACES, BASES COATED WITH SUCH METHOD, AND THEIR USE | 2015 |
|
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| SINGLE-STEP METHOD FOR PRETREATMENT OF METAL SUBSTRATES FOR METAL COLD FORMING | 2021 |
|
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| NOVEL NON-CHROMIUM CONTAINING COMPOSITION FOR METAL TREATMENT | 2005 |
|
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| IMPROVED METHOD FOR ANTICORROSIVE PRETREATMENT OF METAL SURFACES INCLUDING STEEL, GALVANIZED STEEL, ALUMINUM, MAGNESIUM, AND / OR ZINC-MAGNESIUM ALLOY | 2017 |
|
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| METHOD FOR TREATMENT OF SURFACES CONTAINING ALUMINIUM BASES | 2019 |
|
RU2797669C2 |
| ZIRCONIUM- AND TITANIUM-BEARING PHOSPHATING SOLUTION FOR PASSIVATION OF METAL COMPOSITE SURFACES | 2007 |
|
RU2464356C2 |
| METHOD FOR TREATMENT OF SURFACES CONTAINING ALUMINUM BASES | 2019 |
|
RU2797854C2 |
| METHOD OF SPECIAL ADJUSTMENT OF ELECTRIC CONDUCTIVITY OF CONVERSION COATINGS | 2016 |
|
RU2721971C2 |
| METHOD FOR PRE-PROCESSING OF ALUMINUM MATERIALS, ESPECIALLY ALUMINUM DISCS | 2018 |
|
RU2778535C2 |
