SU531892A1 - Solution for passivating zinc and cadmium surfaces - Google Patents

Description

| Г1 р н м с р 1. Solution contains p

Ozi A: Via Cr + 6) - -, Q

Ma-gyn serkskisly (3

on Mg-i-2) 1.5

Sodium hydrochloride (in lereschete: on СНзСОО-) 14

Sodium formic acid (in terms of. On K-СОО-) 42 Nitric | acid To pH 2.5 VDA Up to 1 l. Proceos are burning at 22 ° C; for 30 s. The p-famarch is covered with a uniform, without tingling, lary-shaped |; 1 light green inacIA11 PLA: H1COI.

The corrosion resistance of the film's receiving is 144 hours as measured in salt fog. Approx. 2. Solution contains, g: Ka „Lies dvuf0 (movokislysly (in lereschete pas C g +) 25

Mapnpy autobiotic (in terms of

on M.g-i-2) 0.2

Potassium uk.susns kslyy (in terms of СНзСОО-) 48 AMiMOiH and and mura avy-11NO | Kis l y and

(in terms of. on NGSU) 46

Sulfuric acid, up to pH 3.0

Water Up to 1 l.

Oipoueicc are kept at 25 ° C for 60 s. At 1 arch. 1 | St cover with a uniform colorless (lacquer tee my-green passivia in light.

The corrosion resistance of the resulting film is 168 hours in a chamber of saline mist.

Example 3. The solution contains, g: Chromic anhydride (IB in terms of Cr + s) 15 Ma: g; nium sulphate (in terms of titanium, 5

Acrylic acid (in terms of

on СНзСОО-) 20

Mur1avain1a acid (in terms of

on NSOO-) 24

Vo1D.aDo 1 l.

Ilpoiueci; conducted at 25 ° C and ipH 1.5 for 45 s.

KoippasHiOHHiaH The stability of the films obtained is 120 hours in the salt chamber.

scientifically schooled pz; / p; x razorzorosis, insane brilliant zinc ort cadmium-free gal acolpoxes; 01PPa resistance l-rp operation in TS; yellow atmospheric conditions, such as maritime climate.

Claims (3)

1. The solution for passivating zinc-containing and admium solutions (surfaces containing a compound of progressive chromium, for example, xpoiMOSbm a1H: hydride or chromium salt, chose sulfide from the group of ammonium salts, alkaline or alkaline chloroprotic metal, magnesium salt, and potassium sulfate. mileral acid and water, distinguished by the fact that, in order to obtain a homogeneous protective film of green color, it additionally contains acetic acid and formic acid (ACIDS or their salts of the following CO relate to comm P01e1Ntov, g: Ago chromium (in terms of Cr +) 10-25 Mg salts (in terms of H (a, 2-2.5 Acetic acid or its salt ((In terms of “a SNZSOO -) 14-48 Muravil kslot or its salt (not counted by NSOO) 24-46 Mineral (acid Up to pH 1.5-3.5 Wada, Up to 1 l. 2.Ra. floor. 1, that is, with the fact that, as the salt of acetic acid, it contains the salt of ammonium, alkali or 0 alkaline earth metal or their mixture. 3. Solution 1LO 1n. 1, with the fact that, as; Ool of formic acid, it contains an alkali metal or alkaline earth metal salt or a mixture thereof. 5 Sources of information taken into consideration by MiaHHe during the examination: 1. US Patent No. 2393663, cl. 148-6.2, publ. 1946. 2. Avt. dz No. 425504, M.C. C 23 F 9/00, 0 1971.