Calcium zinc molybdate

Property Zinc molybdate pigment Calcium zinc molybdate pigment Basic sodium zinc molybdate pigment Basic calcium zinc phosphomolybdate pigment... 

Chem. Descrip. Basic calcium zinc molybdate-based Uses Corrosion inhibitor for protective coatings Eeatures Economical stable synergistic with zinc phosphate Properties Wh. fine powd. < 0.1% 325 mesh residue 3.2 p mean particle size nodular shape sp.gr. 3.0 oil absorp. 17 g/100 g < 0.5% moisture... 

Calcium zinc molybdate. See Calcium-zinc-molybdenum complex... 

Synonyms Calcium zinc molybdate Molybdenum white... 

Calcium zinc molybdate. See Calcium-zinc-molybdenum complex Calcium-zinc-molybdenum complex Synonyms Calcium zinc molybdate Molybdenum white Formula CaO xZnO yMoOa ZH2O Properties Wh. powd. insol. in water dens. 3.00 kg/l... 

Typical pigment Zinc phosphate Zinc phosphate Calcium zinc molybdate (CZM) NaV03+ Corrostain (Ca, Zn, P, Si and 0)... 

Basic calcium zinc molybdate/zinc phosphate... 

A high efficiency calcium zinc molybdate cozgtound... 

A number of other molybdenum compounds are used in paint and coatings. These include molybdenum trioxide (Climax), as well as zinc and calcium/zinc molybdates, sold under the trade name Kemgard (Sherwin Williams). Although effective as inmmescent flame retardants and smoke suppressants in coatings, as yet they have not proven so in flexible vinyl compounds. This may relate to the fuel source in flexible vinyl being mainly mobile plasticizer rather than flammable polymer these additives might be revisited, if need be, in unplasticized compounds. With low levels of flammable plasticizer, it is possible to replace about half the antimony oxide content with molybdenum trioxide with similar LOI results. 

The search for new, effective anticorrosive pigments with low toxicity to replace red lead and chromates in paints has occupied the attention of many paint-making companies recently. Barium metaborate, calcium molybdate and zinc molybdate have been identified as possible compounds but they have not found general acceptance in the United Kingdom and western Europe, most probably because of their lower cost effectiveness. 

Quantitative risk assessments have been performed on a variety of flame-retardants used both in upholstered furniture fabric and foam. The National Research Council performed a quantitative risk assessment on 16 chemicals (or chemical classes) identified by the U.S. Consumer Product Safety Commission (CPSC). The results were published in 2000.88 The 16 flame-retardants included in this NRC study were HBCD, deca-BDE, alumina trihydrate, magnesium hydroxide, zinc borate, calcium and zinc molybdates, antimony trioxide, antimony pentoxide and sodium antimonate, ammonium polyphosphates, phosphonic acid, (3- [hydroxymethyl]amino -3-oxopropyl)-dimethylester, organic phosphonates, tris (monochloropropyl) phosphate, tris (l,3-dichloropropyl-2) phosphate, aromatic phosphate plasticisers, tetrakis (hydroxymethyl) hydronium salts, and chlorinated paraffins. The conclusions of the assessment was that the following flame-retardants can be used on residential furniture with minimal risk, even under worst-case assumptions ... 

Aluminum trihydrate, magnesium hydroxide, calcium and zinc molybdates, antimony pentoxide, and zinc borate are examples of inorganic compounds used as flame retardants in the manufacture of household furniture, upholstery, wall coverings, draperies, and carpets (National Research Council (NRC), 2000). Antimony trioxide is sometimes used in combination... 

Calcium tjoroslllcale pigment, corrosion inhibiting alkyds Calcium boroslllcate. Strontium zinc molybdate phos/ slllcate pigment, corrosion inhibiting aq. coalings Calcium zinc phosphomolybda, Moly-White MZAP... 

Stronbum zinc molybdate phosphoslllcate pigment, corrosion inhibiting wash primers Moly-White 92 pigment, corrosion inhibitor Calcium molybdate... 

Busan 11-Ml Busan 11-M2 Cotrol BMB Cotrol BMB-1 13765-19-0 Calcium chromate 13767-32-3 Moly-White 92 Moly-White 101 Moly-White 101 ED-Plus Moly-White 331 Zinc molybdate 13822-56-5... 

Molybdenum tungsten hydroxide oxide phosphate, compd. with ethyl 2-(6-ethylamino)-3-(ethylimino)-2,7-dimethyl-3H-xanthen-9-yl) benzoate. See Pigment red 81 Molybdenum white. See Calcium-zinc-molybdenum complex Zinc molybdate Molybdic acid, ammonium salt, tetrahydrate. 

See Calcium-zinc-molybdenum complex /Wo/y-Wh/fe 331. See Zinc molybdate Moiy-Whit 501. See Calcium molybdate Moiy-Whit Zinc Phosphate. See Zinc phosphate... 

Moiybdates. Calcium molybdates and zinc molybdates and various modifications thereof (15) are commercially available from Sherwin Williams as KEMGARDS, and are principally used in PVC as smoke suppressants (15). 

Kemgard product chemistries include zinc molybdate, calcium sine molybdate and zinc oxide/phosphate cosplexes. 

Chromates have been the most widely used passivating inhibitors in coatings, although toxicity and carcinogenicity potential have prompted use of molybdates (zinc and calcium zinc) and zinc phosphate in their place in certain cases. Alkaline extenders, such as wollastonite, are used as synergists with passivators in some applications, apparently providing a beneficial pH buffering effect. 

Coatings, Paints, and Pigments. Various slightly soluble molybdates, such as those of zinc, calcium, and strontium, provide long-term corrosion control as undercoatings on ferrous metals (90—92). The mechanism of action presumably involves the slow release of molybdate ion, which forms an insoluble ferric molybdate protective layer. This layer is insoluble in neutral or basic solution. A primary impetus for the use of molybdenum, generally in place of chromium, is the lower toxicity of the molybdenum compound. 

H. 8-Hydroxyquinaldine (XI). The reactions of 8-hydroxyquinaldine are, in general, similar to 8-hydroxyquinoline described under (C) above, but unlike the latter it does not produce an insoluble complex with aluminium. In acetic acid-acetate solution precipitates are formed with bismuth, cadmium, copper, iron(II) and iron(III), chromium, manganese, nickel, silver, zinc, titanium (Ti02 + ), molybdate, tungstate, and vanadate. The same ions are precipitated in ammoniacal solution with the exception of molybdate, tungstate, and vanadate, but with the addition of lead, calcium, strontium, and magnesium aluminium is not precipitated, but tartrate must be added to prevent the separation of aluminium hydroxide. 

Bis(benzene)chromium dichromate, 3851 Calcium chromate, 3926 Copper chromate oxide, 4223 Dibismuth dichromium nonaoxide, 0232 Lead chromate, 4243 Lithium chromate, 4236 Magnesium permanganate, 4691 Potassium dichromate, 4248 Potassium permanganate, 4647 Sodium dichromate, 4250 Sodium molybdate, 4713 Sodium permanganate, 4703 Zinc permanganate, 4710... 

Molybdenum salts used as catalysts include cobalt molybdate for hydrogen treatment of petroleum stocks for desulfurization, and phospho-molybdates to promote oxidation. Compounds used for dyes are sodium, potassium, and ammonium molybdates. With basic dyes, phosphomolyb-dic acid is employed. The pigment known as molybdenum orange is a mixed crystal of lead chromate and lead molybdate. Sodium molybdate, or molybdic oxide, is added to fertilizers as a beneficial trace element. Zinc and calcium molybdate serve as inhibitory pigments in protective coatings arid paint for metals subjected to a corrosive atmosphere. Compounds used to produce better adherence of enamels are molybdenum trioxide and ammonium, sodium, calcium, barium, and lead molybdates. 

The use of the pure molybdate-based pigments available on the market is limited due to their cost [5.53, 5.56]. To overcome this disadvantage, molybdate, and phosphate pigments are combined (see Section 5.2.5.2.) or molybdate compounds are apphed to inorganic fillers like calcium carbonate and/or zinc oxide [5.56, 5.91]. 

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