ZINC potassium chromate

Base Information

• Chemical Name: ZINC potassium chromate
• CAS No.: 11103-86-9
• Deprecated CAS: 12527-08-1,37809-34-0,37809-34-0
• Molecular Formula: Cr2HO9Zn2•K
• Molecular Weight: 418.85
• European Community (EC) Number: 234-329-8
• ICSC Number: 1775
• DSSTox Substance ID: DTXSID2026313

Synonyms:ZINC POTASSIUM CHROMATE;11103-86-9;Potassium zinc chromate hydroxide;Potassium zinc chromate;Potassium hydroxyoctaoxodizincatedichromate(1-);CCRIS 4743;HSDB 1060;EINECS 234-329-8;Potassium zinc chromate hydroxide (KZn2(CrO4)2(OH));Chromic acid, potassium zinc salt (2:2:1);potassium;dizinc;dioxido(dioxo)chromium;hydroxide;Chromate(1-), hydroxyoctaoxodizincatedi-, potassium;37224-57-0;EC 234-329-8;CrO4.HO.K.Zn;Cr2HO9Zn2.K;Cr-O4.H-O.K.Zn;DTXSID2026313;LS-2090

Chemical Property of ZINC potassium chromate

Chemical Property:

• Boiling Point: °Cat760mmHg
• Flash Point: °C
• PSA: 0.00000
• Density: g/cm³
• LogP: 0.00000
• Water Solubility.: 500mg/L at 20℃
• Hydrogen Bond Donor Count: 1
• Hydrogen Bond Acceptor Count: 9
• Rotatable Bond Count: 0
• Exact Mass: 417.66195
• Heavy Atom Count: 14
• Complexity: 62.2

Purity/Quality:

98% ^*data from raw suppliers

Safty Information:

• Pictogram(s): Toxic by ingestion.
• Hazard Codes: Toxic by ingestion.

MSDS Files:

Useful:

• Chemical Classes: Metals -> Chromium Compounds, Inorganic
• Canonical SMILES: [OH-].[O-][Cr](=O)(=O)[O-].[O-][Cr](=O)(=O)[O-].[K+].[Zn+2].[Zn+2]
• Inhalation Risk: A harmful concentration of airborne particles can be reached quickly when dispersed.
• Effects of Short Term Exposure: The substance is irritating to the respiratory tract.
• Effects of Long Term Exposure: Repeated or prolonged contact may cause skin sensitization. Repeated or prolonged inhalation may cause nasal ulceration. This may result in perforation of the nasal septum. This substance is carcinogenic to humans.
• Description: Potassium hydroxyoctaoxodizincatedichromate (zinc potassium chromate) is a green-yellow, odorless solid. It is one of a number of chromate compounds used as inhibitors of rust and metal corrosion. While the counterions zinc and potassium lend unique physical and chemical characteristics to the compound, characteristics such as acidity and solubility, it is the chromate ion that gives rise to most critical properties, both industrially and toxicologically. Ionic chromium (Cr) is typically found in either the hexavalent (Cr(VI)) or trivalent (Cr(III)) oxidation states. Chromate ion (CrO4--2) is among the most common Cr(VI) compounds. Other common Cr(VI) compounds include dichromate (Cr2O7-2), and chromium trioxide (CrO3). In aqueous solution, Cr(VI) exists as hydrochromate (HCrO4-), CrO4-2, or Cr2O7-2. Dichromate is the dimer of chromate. The three species exist in equilibrium with one another, the proportion of each being concentration and pH dependent. Chromate ion is the predominant form in dilute solutions at neutral pH. Under these conditions, very little dichromate exists and the ratio of chromate to hydrochromate is about 3 to 1. Hydrochromate becomes the dominant species of Cr(VI) when the pH becomes mildly acidic (<6). In concentrated solutions of Cr(VI) in strongly acidic conditions, dichromate becomes the dominant species. Specific data and literature regarding the toxicity and characteristics of zinc potassium chromate are limited. On the other hand, literature relating to the health and environmental effects of chromates and other Cr(VI) compounds is much more extensive. Most experimentalists and regulatory agencies make the assumption that chromates, dichromates, and indeed, all Cr(VI) compounds behave similarly in biological systems.For this reason, Cr(IV) compounds and their biological behavior are often discussed as a class; in the same way, Cr(III) compounds are often lumped together. When data specific to zinc potassium chromate are available, it is presented. In other cases, generalizations available from studies of chromates as a class or Cr(VI) compounds will be presented.
• Uses: Zinc potassium chromate is one of several chromates used as anticorrosive agents in the formulation of coatings and primers. Chromates are widely used as inhibitors of corrosion and rust because of their unique ability to react at the metal coating interface to inhibit corrosion, especially galvanic couple corrosion (a chemical reaction that involves electron exchange between different metals). For example, using stainless steel screws on an aluminum part provides a high potential for electron transfer (galvanic couple corrosion). Even when present in very low concentrations, chromate has the unique ability to actively suppress electron transfer at both cathodic and anodic sites when different metallic parts are in contact. Active protection against rust depends on the ability of the inhibitor to migrate to the exposed surface once the protective coating has been scratched or damaged. Inhibitors dissolve in water and migrate to the exposed surface. If the inhibitor’s solubility is too great it may be washed away, if the solubility is too low the inhibitor will have low activity. According to the literature, strontium chromate has an ideal solubility (1.06 g l-1); zinc potassium chromate has similar solubility (0.5–1.5 g l-1) and is a very effective inhibitor. No single nonchrome inhibitor tested thus far acts in this way. Potassium Hydroxyoctaoxodizincatedichromate is a corrosion-inhibiting zinc pigment used to protect steel and other metals.

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