摘要:
Uncured solvent-based paint may be flushed from a paint delivery installation using a substantially non-aqueous composition containing one or more organic solvents and a polymer having acid and/or amine functional groups.
摘要:
Excellent adhesion to subsequently applied paint or elastomer is obtained by coating a metal substrate with a phosphate conversion coating by contact with a liquid phosphating solution that contains zinc cations, phosphate anions, and at least one adhesion promoter selected from (i) film-forming organic substances, (ii) polymers of vinyl phenols modified by substitution of substituted aminomethyl moieties on their aromatic rings, (iii) inorganic oxides of one of the elements silicon, aluminum, titanium, and zirconium. Preferably, the phosphating solution also contains manganese and nickel cations and either iron cations or hydroxylamine. If adhesion to paint is desired, the adhesion promoter preferably is an acrylic film-forming substance, while if adhesion to elastomers is desired, the adhesion promoter preferably is a polymer of vinyl phenol and the phosphating solution preferably also contains calcium cations.
摘要:
A high etch cleaner for aluminum and aluminum alloy substrates that leads to enhanced corrosion protective performance of a variety of anti-corrosion pretreatments. The cleaner comprises low levels of silicate of from 0 to 250 ppm, 50 to 500 ppm of at least one chelator, and has a pH of from 11.0 to 13.5. The cleaner may be used to etch from 0.5 to 4.0 grams per meter squared from substrates. Substrates treated with the cleaner and then coated with a variety of anti-corrosion pretreatments and outer coatings show enhanced corrosion resistance compared to substrates cleaned with standard cleaners that have low etch rates, high silicate levels and no chelating agents followed by anti-corrosion pretreatments and outer coatings.
摘要:
When a phosphate ester or a dispersed wax is added to a conventional liquid phosphate conversion coating composition, the resulting phosphate coating formed on a metal substrate has a lower coefficient of friction after being oiled than it would have had if the additive had been omitted. The corrosion resistance and paint adhesion properties expected from the conversion coating are not substantially diminished by the additive. Particularly good results are achieved if the phosphate coating composition contains calcium and ferrous cations and the liquid phosphate conversion coating composition is dried into place on the substrate.
摘要:
A metal substrate is provided with a coating that (i) provides substantial corrosion resistance, (ii) makes it possible to shape the substrate by roll forming and similar light cold forming operations without the need for any oil or wax lubricant, and (iii) has good adhesion to subsequently applied paint. This is achieved by coating the metal substrate surface with an aqueous liquid composition that contains acrylate polymer resin, wax, and hexavalent chromium and then drying this coating into place on the surface to produce the desired dry coating.
摘要:
Zinciferous and/or aluminiferous metal surfaces can be passivated by treatment with a chromium-free aqueous solution of phosphoric acid and molybdenum that is at least partially in a valence state lower than +6, to produce, especially with an acrylic overcoating, a surface as resistant to corrosion as the surface of the same substrate after passivation with conventional liquid compositions that contain hexavalent chromium.
摘要:
Compositions and methods for depositing improved zirconium oxide conversion coatings, as well as compositions capable of depositing an adherent zirconium oxide conversion coating on a substrate in the absence of prior cleaning are provided.
摘要:
Excellent adhesion to subsequently applied paint or elastomer is obtained by coating a metal substrate with a phosphate conversion coating by contact with a liquid phosphating solution that contains zinc cations, phosphate anions, and at least one adhesion promoter selected from (i) film-forming organic substances, (ii) polymers of vinyl phenols modified by substitution of substituted aminomethyl moieties on their aromatic rings, (iii) inorganic oxides of one of the elements silicon, aluminum, titanium, and zirconium. Preferably, the phosphating solution also contains manganese and nickel cations and either iron cations or hydroxylamine. If adhesion to paint is desired, the adhesion promoter preferably is an acrylic film-forming substance, while if adhesion to elastomers is desired, the adhesion promoter preferably is a polymer of vinyl phenol and the phosphating solution preferably also contains calcium cations.
摘要:
A concentrated aqueous solution containing: (A) a component of dissolved phosphate ions; (B) a component of dissolved hexavalent chromium; (C) a component of dissolved anions selected from the group consisting of BF.sub.4.sup.-, AlF.sub.6.sup.-3, SiF.sub.6.sup.-2, TiF.sub.6.sup.-2, FeF.sub.6.sup.-3, SnF.sub.6.sup.-2, ZrF.sub.6.sup.-2, and HfF.sub.6.sup.-2 ; and (D) a component of free fluoride ions; and, optionally and preferably, (E) a component of dissolved trivalent chromium; and, optionally, one or more of: (F) a component of dissolved organic substances produced by reducing some hexavalent chromium initially added to trivalent chromium; (G) a component of dissolved, stably suspended, or both dissolved and stably suspended film forming polymer molecules; and (H) a component of dissolved, stably suspended, or both dissolved and stably suspended substances selected from the group consisting of silica and silicates is more resistant to development of precipitates during extended storage than similar compositions without the free fluoride component, and upon dilution makes at least equally satisfactory working compositions for forming a chromate conversion "passivating" coating on zinciferous surfaces.
摘要:
Methods comprising: (a) providing a coating composition comprising a fluoroacid compound of the general formula (I): XpMqFrOs (I) wherein each of q and r independently represents an integer of 1 to 10; each of p and s independently represents an integer from 0 to 10; X represents at least one cation selected from the group consisting of hydrogen, ammonium, alkaline earth metals and alkali metals; and M represents at least one element selected from the group consisting of Ti, Zr, Hf, Si, Sn, Al, Ge, and B; (b) contacting a metal substrate with the coating composition; and (c) adding to the coating composition a component selected from the group consisting of fluorine-free compounds of an element M, Group 2 metal compounds, Group 12 metal compounds, Group 13 compounds, Group 14 compounds, and combination thereof.