Low-Cost, Environmentally Benign, Non-Chromated Corrosive Resistant Coatings

EPA Contract Number: 68D70055
Title: Low-Cost, Environmentally Benign, Non-Chromated Corrosive Resistant Coatings
Investigators: Zheng, Haixing
Small Business: Chemat Technology Inc.
EPA Contact: Richards, April
Phase: II
Project Period: September 1, 1997 through September 1, 1999
Project Amount: $225,000
RFA: Small Business Innovation Research (SBIR) - Phase II (1997) Recipients Lists
Research Category: Nanotechnology , SBIR - Pollution Prevention , Pollution Prevention/Sustainable Development , Small Business Innovation Research (SBIR)


Chromate conversion coatings are widely used in industries to protect light metals (e.g., aluminum alloys) from corrosion. However, hexavalent chromium involved in the process is considered to be carcinogenic. The development of non-chromate environmentally benign conversion coatings is mandated. Currently, the only alternative process available is the use of non-chromate sealed anodized coatings, which is unfortunately costly. In the Phase I project, Chemat Technology successfully demonstrated the feasibility of using their proprietary sol-gel derived coatings with the sealants and corrosion inhibitors as the non-chromated corrosion resistance coating. Thick coatings with excellent metal adhesion and superior corrosion resistance have been demonstrated. Topcoats (paints) also can adhere to the coating well. No paint-primer is needed in this system - the coating can actually be used as a permanent surface pretreatment and primer. Longer lifetime with much less replacement of surface pretreatment and primers can be expected, resulting in much lower process and maintenance costs. Most importantly, utilization of non-chromated conversion coatings eliminates the use of carcinogenic chromate, which improves worker safety; reduces the cost associated with hazardous material handling, storage, and disposal; and reduces significantly the use of the rinsing water, thus reducing cost associated with treatment of wastewater. After developing and commercializing this sol-gel process in the Phase II program, a low-cost, environmentally benign process for non-chromated, permanent corrosion resistance coatings can be developed.

Publications and Presentations:

Publications have been submitted on this project: View all 1 publications for this project

Supplemental Keywords:

small business, SBIR, wastewater treatment, pollution prevention, engineering, chemistry., RFA, Scientific Discipline, Toxics, Waste, Sustainable Industry/Business, hexavalent chromium, hexavalent chromium waste, Chemical Engineering, cleaner production/pollution prevention, Sustainable Environment, Environmental Chemistry, Chemistry, Technology for Sustainable Environment, Chemistry and Materials Science, 33/50, Engineering, Environmental Engineering, corrosion resistant, chromium & chromium compounds, aluminothermic chromium metal, environmentally benign coating, Chromium, conversion coating, chromate substitution, non-toxic hard chromium coatings, environmentally benign coatings, pollution prevention, coatings

Progress and Final Reports:

  • Final

  • SBIR Phase I:

    Low-Cost, Environmentally Benign, Non-Chromated Corrosive Resistant Coatings