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This paper describes the range of copper alloys in marine service today and the evolution of applications which include ships' cannon and hull sheathing in 18th and 19th century and condenser and seawater piping requirements which spurred concentrated investigations in the 20th century.
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In this paper, a new concept named CP by distributed sacrificial anodes (DSA) is presented. The main principle of CP by DSA is to convert cathode area to anode area by distributing anode mass over the surface of the equipment to be protected.
The effect of soluble salts on long-term durability of carbon steels coated with epoxy paint. A surface was contaminated by different soluble salt concentrations. Based on NORSOK M-501 and ISO 20340, immersion and cathodic disbonding test were done for 6 months.
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.
MIC is a problem in the oil and gas industry due to seawater injection. Biocides lead to resistance by microbes over time. In this work, D-amino acids were used to enhance the tetrakis (hydroxymethyl) phosphonium sulfate (THPS) biocide against a tough field biofilm consortium.
Aerospace assets are subjected to routine maintenance cycles to prevent, monitor, and repair corrosion damage. Currently, the maintenance cycles are determined according to its model and following its respective requirements document (eg: NA(1) 01-1A-5091 or USAF(2) Technical Order 1-1-691).2 A new paradigm of condition-based maintenance (CBM) is highly desired, as a given asset will require different prevention, monitoring, and repair maintenance cycles depending on where it is deployed. As corrosion is the degradation of a material in response to its environment, CBM takes into consideration the variability of the environment (the conditions to which an asset is exposed) when determining appropriate maintenance intervals and what should be done at each interval.
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 AMPP Code of Ethics is discussed in conjunction with relevant case studies and features real-life ethical violations of the AMPP attestations. Frameworks for making ethical decisions are also reviewed in this course along with the factors in the corrosion industry that can lead to unethical behavior.
This is an online, self-paced course which should take 1.5 to 2 hours to complete. After you have purchased the course in the store, log into your AMPP profile and select “Online Courses” to begin.
Purchase of this course includes a one-year subscription and is non-refundable. Students will have access to all course materials for a period of one year from the date of registration. All course work must be completed during this time period. Extensions or transfers cannot be granted.
Permissible level of sulfur emissions from ocean vessels have been reduced. Diesel exhaust scrubbers are one response. The scrubber environment requires corrosion resistant alloys. This study compares multiple alloys in several simulated scrubber environments.
As the maritime industry continues to push forward negotiating obstacles regarding cost reduction and efficiency, many advancements have been made over the years. Robotic welding, paperless quality control and advanced coatings have all played large roles in the overall success of the primary goals. One major improvement has been the integration of non-ferrous and composite materials for construction. Lighter materials that exhibit better corrosion resistance over steel are seeing increased use in ship and platform construction. While composites are gaining rapid interest and share, aluminum alloy is the fastest integrated material used to date.
Answers for common questions concerning galvanic corrosion. Galvanic corrosion & how to stop it. Prevention. Additional offshore environments (low oxygen and high temperature), caustic soda and atmospheric applications. 2nd edition 2017 NACE
Galvanic primers have been found to be effective at reducing crack formation aluminum alloys. This paper will review primers that Luna has developed and explore a variety of commercially available ones.
This paper describes a novel methodology to measure the Critical Pitting Temperature (CPT) of a Duplex Stainless Steels (DSS) in artificial seawater based on the Electrochemical Noise (ECN) technique.