Structural, ballistic, and mobility requirements have led to the selection of aluminum alloy 2519 as the primary structural material for the Advanced Amphibious Assault Vehicle (AAAV). Two-year seawater alternate immersion exposures of welded AI 2519 panels with and without protective coatings were conducted to simulate the expected AAAV service environment.
Service life of any weapon system depends upon factors that impart long-term durability and robustness to its structure and subsystems, while sustaining its functional properties. The paper describes basic principles and guidelines on corrosion control and rules that could be easily followed to ascertain some specified service life and reduce total ownership costs.
The Hanford site contains approximately 55 million gallons of radioactive and chemically hazardous wastes arising from weapons production. This paper will present a Bayesian framework to model the probability of tank failures at Hanford and illustrate its use for tanks that are already known to have failed and leaked waste.
This NACE/EFC standard is considered as the basis for the cleaning, surface preparation, and application of paint and coating systems to Navy ships used in marine environments for New Build, and during Life Cycle maintenance and permanent repair. It is intended for use by naval corrosion control personnel, coating applicators, and coating manufacturers. It covers coating materials, coating test protocol and acceptance criteria, surface preparation, coating application, quality assurance and control, and repair methods. Its purpose is to facilitate more effective corrosion protection of Navy ships and support inter-operability requirements by presenting reliable information and providing guidelines for coating manufacturers and shipyards to develop more durable specifications.
This standard replaces NATO Allied Engineering Publication (AEP) 59.
Chloride induced corrosion is the prime reason for the degradation of embedded rebar in reinforced concrete marine structures. The present study experimentally investigates the effectiveness of traditional two-component epoxy (EPX), and moisture-cure polyurethane coatings (MC) applied on the concrete surface in reducing the rate of chloride ingression compared to the conventional concrete with and without mineral admixtures like fly ash and GGBS. Coatings used in the present study are characterized by XRD, EDAX, FEG-SEM, water uptake, adhesion strength and contact angle tests. Rapid chloride migration tests (RCMT) were conducted on concrete with and without coatings. Resistivity offered against the chloride migration monitored during the RCMT test indicated that concrete with MC shown higher resistivity in the initial period and continued to decrease over the test duration at a faster rate, unlike EPX. The non-steady-state migration coefficients of the concrete cured for 28days and coated with MC and EPX coatings were found to be nearly 22% and 48% of that of concrete with SCM cured for 84days respectively. The study is further extended to monitor the corrosion of rebar embedded in coated concrete subjected to corrosion acceleration until the first crack appeared on an uncoated specimen. Variation in current flow, half-cell potentials recorded during the acceleration test and actual mass loss of embedded rebar estimated by gravimetric analysis are presented in this paper.
The corrosion profession, and the certified professionals who work in the industry, are committed to protecting people, assets and the environment from the effects of corrosion. Those tasked with delivering the technical expertise to society must conduct their work with the knowledge and understanding of the ethical principles expected and required of those professionals.
The NACE International Code of Ethics is discussed in conjunction with case studies and features real-life ethical violations of the NACE International Institute attestations. Frameworks for making ethical decisions are reviewed in this course along with the factors in the corrosion industry that can lead to unethical behavior.
The course is an online, self-paced course in Spanish which should take no longer than 1.5 to 2 hours to complete.
Section 1 | Introduction
Section 2 | Professional Ethics
Section 3 | Factors that Lead to Unethical Decision Making
Section 4 | Types of Unethical Behavior
Section 5 | A Framework for Ethical Decision Making