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Extramural Research

2001 Progress Report: Zeolite Coatings by In-Situ Crystallization as an Environmentally Benign Alternative to Chromate Conversion and Anodization Coatings

EPA Grant Number: R828134
Title: Zeolite Coatings by In-Situ Crystallization as an Environmentally Benign Alternative to Chromate Conversion and Anodization Coatings
Investigators: Yan, Yushan
Institution: University of California - Riverside
EPA Project Officer: Richards, April
Project Period: August 1, 2000 through July 31, 2003 (Extended to July 31, 2004)
Project Period Covered by this Report: August 1, 2000 through July 31, 2001
Project Amount: $250,316
RFA: Technology for a Sustainable Environment (1999)
Research Category: Nanotechnology , Pollution Prevention/Sustainable Development

Description:

Objective:

The objective of this proposed project is to develop a chromium-free zeolite coating that has comparable thickness to chromate conversion and anodization coatings and equivalent or superior performance in coating adhesion, corrosion protection, abrasion resistance, and paint adhesion. An intrinsically inexpensive, safe, and nonpolluting in-situ crystallization process that is capable of coating large surfaces with complex shapes and in confined spaces also will be developed. Zeolites are microporous crystalline silicate materials and have widely been exploited for their microporosity (< 15?) as catalysts and separation media. However, many high silica zeolites are nonporous in their as-synthesized state because of the organic molecules occluded in their pores during crystallization. High silica zeolites also are known for their thermal and chemical stability and high mechanical strength. The goal of this project is to explore these dense polycrystalline high silica or pure silica zeolite films in their as-synthesized state for corrosion protection.

Progress Summary:

We have demonstrated that high silica zeolite ZSM-5 coatings on aluminum alloys and steel are extremely corrosion resistant in strong acids, bases, and pitting aggressive environments. We also have demonstrated that the in-situ crystallization coating deposition method we developed is capable of coating surfaces of complex shapes and in confined spaces?two key features of an anodization process. Also, we have demonstrated that the ZSM-5 coating has good adhesion and thermal and thermal shock stability and performs reasonably well under bending and mechanical impact. It also can be easily painted with widely used polymeric paints.

Future Activities:

We are extending this technology to other zeolites such as MTW, BEA, LTA, and MFI with different composition to study if the approach is general for all zeolites. Also, we are investigating to shorten the deposition time and lower the reaction pressure.


Journal Articles on this Report : 1 Displayed | Download in RIS Format

Other project views: All 37 publications 19 publications in selected types All 17 journal articles

Type Citation Project Document Sources
Journal Article Cheng X, Wang Z, Yan Y. Corrosion-resistant zeolite coatings by in situ crystallization. Electrochemical and Solid-State Letters 2001;4(5):B23-B26 R828134 (2001)
R828134 (2002)
R828134 (2003)
R828134 (Final)
not available
Supplemental Keywords:

corrosion, zeolite, coating, film, thin film, aluminum, aluminum alloys, steel, chromium, anodization, conversion coating., RFA, Scientific Discipline, Toxics, Water, Sustainable Industry/Business, cleaner production/pollution prevention, Wastewater, Environmental Chemistry, Sustainable Environment, Technology for Sustainable Environment, 33/50, Environmental Engineering, hexavalent chromium, in situ crystallization, chromium & chromium compounds, cleaner production, zeolites, environmentally conscious manufacturing, environmentally benign solvents, alternative materials, metal plating industry, anodization coatings, coating processes, carcinogenicity, innovative technology, microelectronics, pollution prevention, water treatment, corrsion protection, green chemistry

Relevant Websites:

http://www.engr.ucr.edu/~yushan Exit EPA icon

Progress and Final Reports:
Original Abstract
2002 Progress Report
2003 Progress Report
Final Report

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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