Inexpensive Non-Toxic Pigment Substitute for Chromium in Primer for Aluminum Sibstrate

EPA Grant Number: R827933C016
Subproject: this is subproject number 016 , established and managed by the Center Director under grant R825427
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).

Center: Urban Waste Management and Research Center (University New Orleans)
Center Director: McManis, Kenneth
Title: Inexpensive Non-Toxic Pigment Substitute for Chromium in Primer for Aluminum Sibstrate
Investigators: Daech, Al
Institution: University of New Orleans
EPA Project Officer: Lasat, Mitch
Project Period:    
RFA: Urban Waste Management & Research Center (1998) RFA Text |  Recipients Lists
Research Category: Targeted Research

Objective:

One objective of this project is to identify non-polluting, Lithium-based inhibitors for suppressing the corrosion of aluminum alloys to a degree that they will represent satisfactory substitutes for environmentally hazardous chromium coatings that are widely used in protecting marine structures.

Since all corrosion involves oxidation and reduction, it can be measured by observing the flow of electrons in a system. A device which does this is a APotentiostat.@ If no current flows, corrosion is stopped.

A series of non-carcinogenic and low-toxicity lithium salts passivate aluminum and, hence, interrupt corrosion. A statistical series was set up to optimize the salts. A patent application is being prepared since a literature search has indicated that this is a new approach.

Another concept which shows promise is to heat aluminum-lithium alloys (about 3% lithium) to 350 C for 30 minutes in argon gas. This relocates the lithium onto the surface of small (200 to 320 mesh) pigment particles. In this way, the passivating lithium salts can be concentrated on the surface. In many instances only the pigment surface produces passivating influences on the substrate. Since molecules on the surface are a very small percentage on the order of one atom to ten thousand interior atoms, the amount of passivating chemical can be much less. A patent application is also being prepared on this concept. This concept is called "nanostructural inhibitors."

The second objective is to incorporate these inhibitors into a paint vehicle as primers. An arrangement has been made with "EuroNavy USA" for this phase, which has not yet begun. They will test and manufacture the paints.

The final objective is to adapt the products to Navy requirements for various paint specifications where possible. Some of the proposed passivators have been tested on 1000, 2000, 5000, and 6000 series alloys successfully.

Supplemental Keywords:

RFA, Scientific Discipline, INTERNATIONAL COOPERATION, Waste, TREATMENT/CONTROL, Sustainable Industry/Business, cleaner production/pollution prevention, Sustainable Environment, Chemistry, Technology, Technology for Sustainable Environment, Civil/Environmental Engineering, Hazardous Waste, New/Innovative technologies, Chemistry and Materials Science, Engineering, Hazardous, corrosion resistant, automotive coating, antifouling coating, aluminum coating, nanostructural inhibitors, oxidation reactions, oxidation, clean technologies, Chromium, nanotechnology, chromium free coatings, alternative materials, aluminum conversion coatings, water quality, coating formulations, chromium plating, innovative technologies, pollution prevention, alternative coatings, corrsion protection, coatings, alternative chrome plating, corrosion inhibitors, chromium substitute, green chemistry


Main Center Abstract and Reports:

R825427    Urban Waste Management and Research Center (University New Orleans)

Subprojects under this Center: (EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
R825427C001 Comprehensive Evaluation of The Dual Trickling Filter Solids Contact Process
R825427C002 Issues Involving the Vertical Expansion of Landfills
R825427C003 Deep Foundations on Brownfields Sites
R825427C004 Ambient Particulate Concentration Model for Traffic Intersections
R825427C005 Effectiveness of Rehabilitation Approaches for I/I Reduction
R825427C006 Urban Solid Waste Management Videos
R825427C007 UWMRC Community Outreach Multimedia Exhibit
R825427C008 Including New Technology into the Investigation of Inappropriate Pollutant Entries into Storm Drainage Systems - A User's Guide
R825427C009 Investigation of Hydraulic Characteristics and Alternative Model Development of Subsurface Flow Constructed Wetlands
R825427C010 Beneficial Use Of Urban Runoff For Wetland Enhancement
R825427C011 Urban Storm and Waste Water Outfall Modeling
R827933C001 Development of a Model Sediment Control Ordinance for Louisiana
R827933C002 Inappropriate Discharge to Stormwater Drainage (Demonstration Project)
R827933C003 Alternate Liner Evaluation Model
R827933C004 LA DNR - DEQ - Regional Waste Management
R827933C005 Landfill Design Specifications
R827933C006 Geosynthetic Clay Liners as Alternative Barrier Systems
R827933C007 Used Tire Monofill
R827933C008 A Comparison of Upflow Anaerobic Sludge Bed (USAB) and the Anaerobic Biofilm Fluidized Bed Reactor (ABFBR) for the Treatment of Municipal Wastewater
R827933C009 Integrated Environmental Management Plan for Shipbuilding Facilities
R827933C010 Nicaragua
R827933C011 Louisiana Environmental Education and Resource Program
R827933C012 Costa Rica - Costa Rican Initiative
R827933C013 Evaluation of Cr(VI) Exposure Assessment in the Shipbuilding Industry
R827933C014 LaTAP, Louisiana Technical Assistance Program: Pollution Prevention for Small Businesses
R827933C015 Louisiana Environmental Leadership Pollution Prevention Program
R827933C016 Inexpensive Non-Toxic Pigment Substitute for Chromium in Primer for Aluminum Sibstrate
R827933C017 China - Innovative Waste Composting Plan for the City of Benxi, People's Rupublic of China
R827933C018 Institutional Control in Brownfields Redevelopment: A Methodology for Community Participation and Sustainability
R827933C019 Physico-Chemical Assessment for Treatment of Storm Water From Impervious Urban Watersheds Typical of the Gulf Coast
R827933C020 Influence of Cyclic Interfacial Redox Conditions on the Structure and Integrity of Clay Liners for Landfills Subject to Variable High Groundwater Conditions in the Gulf Coast Region
R827933C021 Characterizing Moisture Content Within Landfills
R827933C022 Bioreactor Landfill Moisture Management
R827933C023 Urban Water Issues: A Video Series
R827933C024 Water Quality Modeling in Urban Storm Water Systems
R827933C025 The Development of a Web Based Instruction (WBI) Program for the UWMRC User's Guide (Investigation of Inappropriate Pollutant Entries Into Storm Drainage Systems)
R827933C027 Legal Issues of SSO's: Private Property Sources and Non-NPDES Entities
R827933C028 Brownfields Issues: A Video Series
R827933C029 Facultative Landfill Bioreactors (FLB): A Pilot-Scale Study of Waste Stabilization, Landfill Gas Emissions, Leachate Treatment, and Landfill Geotechnical Properties
R827933C030 Advances in Municipal Wastewater Treatment
R827933C031 Design Criteria for Sanitary Sewer System Rehabilitation
R827933C032 Deep Foundations in Brownfield Areas: Continuing Investigation
R827933C033 Gradation-Based Transport, Kinetics, Coagulation, and Flocculation of Urban Watershed Rainfall-Runoff Particulate Matter
R827933C034 Leaching and Stabilization of Solid-Phase Residuals Separated by Storm Water BMPs Capturing Urban Runoff Impacted by Transportation Activities and Infrastructure
R827933C035 Fate of Pathogens in Storm Water Runoff
R87933C020 Influence of Cyclic Interfacial Redox Conditions on the Structure and Integrity of Clay Liners for Landfills Subject to Variable High Groundwater Conditions in the Gulf Coast Region