About Chromates

Chromate Ion

Chromate salts contain the anion CrO42-, while dichromate salts contain the dichromate anion, Cr2O72-. Both classes of compounds contain chromium in the oxidation state +6--hexavalent chromium--and act as strong oxidizing agents. Water soluble chromates are frequently used in chrome electroplating processes used to protect underlying metals from corrosion or improve paint adhesion. Chromate conversion coating, a process which uses oxidants to passivate certain metal alloy surfaces, may utilize chromate derived from chromic acid. Non-soluble chromates have strong colors and have been used as pigments. Because hexavalent chromium is now known to be toxic, chromate waste disposal is regulated and chromate usage is declining in areas where there are suitable substitutes. In particular, chromium pigments such as chrome yellow, widely recognized as the color of American school buses, have largely fallen out of use in favor of safer pigment compounds.

American Elements manufactures multiple forms of chromate compounds including solutions, nanopowders, submicron, and -325 mesh powders, and high surface area materials with particle distribution and particle size controlled and certified. We also produce larger -40 mesh, -100 mesh, -200 mesh range sizes and <0.5 mm, 2 mm, 5 mm and other sizes of shot, granules, lump, flake and pieces. Purities include 99%, 99.9%, 99.99%, 99.999% and 99.9999% (2N, 3N, 4N, 5N and 6N).

American Elements maintains industrial scale production for all its chromate products and will execute Non-Disclosure or Confidentiality Agreements to protect customer know-how.

Recent Research & Development for Chromates

Prolonged exposure to particulate chromate inhibits RAD51 nuclear import mediator proteins., Browning, Cynthia L., and Wise John Pierce , Toxicol Appl Pharmacol, 2017 Sep 15, Volume 331, p.101-107, (2017)

Prolonged particulate chromate exposure does not inhibit homologous recombination repair in North Atlantic right whale (Eubalaena glacialis) lung cells., Browning, Cynthia L., Wise Catherine F., and Wise John Pierce , Toxicol Appl Pharmacol, 2017 Sep 15, Volume 331, p.18-23, (2017)

Reductive solidification/stabilization of chromate in municipal solid waste incineration fly ash by ascorbic acid and blast furnace slag., Zhou, Xian, Zhou Min, Wu Xian, Han Yi, Geng Junjun, Wang Teng, Wan Sha, and Hou Haobo , Chemosphere, 2017 Sep, Volume 182, p.76-84, (2017)

Accelerated redox reaction between chromate and phenolic pollutants during freezing., Ju, Jinjung, Kim Jaesung, Vetráková Ľubica, Seo Jiwon, Heger Dominik, Lee Changha, Yoon Ho-Il, Kim Kitae, and Kim Jungwon , J Hazard Mater, 2017 May 05, Volume 329, p.330-338, (2017)

Characterisation of the rare cadmium chromate pigment in a 19th century tube colour by Raman, FTIR, X-ray and EPR., Christiansen, Marie Bitsch, Sørensen Mikkel Agerbæk, Sanyova Jana, Bendix Jesper, and Simonsen Kim Pilkjær , Spectrochim Acta A Mol Biomol Spectrosc, 2017 Mar 15, Volume 175, p.208-214, (2017)

Mechanochemical and Conventional Synthesis of Zn(II)/Cd(II) Luminescent Coordination Polymers: Dual Sensing Probe for Selective Detection of Chromate Anions and TNP in Aqueous Phase., Parmar, Bhavesh, Rachuri Yadagiri, Bisht Kamal Kumar, Laiya Ridhdhi, and Suresh Eringathodi , Inorg Chem, 2017 Mar 06, Volume 56, Issue 5, p.2627-2638, (2017)

Ba19Cr12O45: A High Pressure Chromate with an Original Structure Solved by Electron Diffraction Tomography and Powder X-ray Diffraction., Lepoittevin, Christophe, Jeanneau Justin, Toulemonde Pierre, Sulpice André, and Núñez-Regueiro Manuel , Inorg Chem, 2017 Jun 05, Volume 56, Issue 11, p.6404-6409, (2017)

Enhancement of chromate reduction in soils by surface modified biochar., Mandal, Sanchita, Sarkar Binoy, Bolan Nanthi, Ok Yong Sik, and Naidu Ravi , J Environ Manage, 2017 Jan 15, Volume 186, Issue Pt 2, p.277-284, (2017)

A simple model to predict chromate partitioning in selected soils from China., Gu, Xueyuan, Xie Jinyu, Wang Xiaorong, and Evans Les J. , J Hazard Mater, 2017 Jan 15, Volume 322, Issue Pt B, p.421-429, (2017)

[Effects on human peripheral erythrocytes of long-term occupational contact with chromate]., Hu, G P., Zhao L, Liu J X., Wang L L., Chen Z J., Zhang Y M., Wang L, Zhao Z C., Yu S F., and Jia G , Zhonghua Yu Fang Yi Xue Za Zhi, 2017 Jan 06, Volume 51, Issue 1, p.41-46, (2017)

Structure, solution assembly, and electroconductivity of nanosized argento-organic-cluster/framework templated by chromate., Li, Xiao-Yu, Su Hai-Feng, Kurmoo Mohamedally, Tung Chen-Ho, Sun Di, and Zheng Lan-Sun , Nanoscale, 2017 Apr 20, Volume 9, Issue 16, p.5305-5314, (2017)

Kinetics and mechanism of desilication reaction in sodium chromate solution using sodium aluminate., Chen, Jianxin, Zhang Xiangchao, Han Jian, Li Yinhui, Su Min, and Lu Aidang , Water Sci Technol, 2017 Apr, Volume 75, Issue 7-8, p.1548-1554, (2017)

Lead chromate detected as a source of atmospheric Pb and Cr (VI) pollution., Lee, Pyeong-Koo, Yu Soonyoung, Chang Hye Jung, Cho Hye Young, Kang Min-Ju, and Chae Byung-Gon , Sci Rep, 2016 Oct 25, Volume 6, p.36088, (2016)

Chromate Allergy in Northern Israel in Relation to Exposure to Cement and Detergents., Kridin, Khalaf, Bergman Reuven, Khamaisi Mogher, and Weltfriend Sara , Dermatitis, 2016 May-Jun, Volume 27, Issue 3, p.131-6, (2016)