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JournalISSN: 1001-1560

Materials protection 

About: Materials protection is an academic journal. The journal publishes majorly in the area(s): Corrosion & Coating. It has an ISSN identifier of 1001-1560. Over the lifetime, 327 publication(s) have been published receiving 791 citation(s).
Topics: Corrosion, Coating, Alloy, Plating, Magnesium alloy


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Journal Article
Abstract: THE TESTS DESCRIBED IN THIS PAPER WERE DESIGNED TO: IDENTIFY THE MECHANISM BY WHICH CORROSION OF STEEL IS INITIATED, PROVIDE QUANITATIVE INFORMATION ABOUT THE EFFECTS OF CHLORIDES, AND DETERMINE IF A PREDICTABLE THRESHOLD OF CORROSION EXISTS LABORATORY STUDIES ARE REPORTED ON THE CORROSION OF BARE STEEL RODS IN ENVIRONMENTS SIMULATING POROUS CONCRETE CONTAMINATED WITH CHLORIDES THE INITIATION OF CORROSION IS SHOWN TO REQUIRE FREE OXYGEN AT THE STEEL SURFACE AND A RATIO OF CHLORIDE TO HYDROXYL ION ACTIVITY OF AT LEAST 06 A PROBABILITY MODEL IS USED TO EXPLAIN THE CHLORIDE EFFECT AND TO PREDICT THE THRESHOLD VALUE CAUSING CORROSION /AUTHOR/

234 citations

Journal Article
Abstract: Corrosion data are reported for 20 structural ferrous metals exposed up to 16 yr in natural tropical waters, including seawater, fresh water and mean tide elevation. Time- corrosion curves derived from both weight loss and pitting are presented for many of the ferrous alloys and tabulated data for all metal environment combinations are included. These comprehensive long term results comprise the most extensive collection of accurate seawater and fresh water corrosion data presently available.

29 citations

Journal Article
Abstract: Cu and Cu alloys show weight losses in tropical water from 1.4 to 2 times that in temperate waters; tropical marine atmosphere also cause higher weight losses. Corrosion of commercially pure Cu for 16 years in tropical sea water was approximately proportional to Ct 1/2 C isa constant and t is time of exposure). Corrosion-time functions for the other high Cu and alpha-phase Cu-Zn alloys were generally curvilinear for the first 4-8 years exposures. Extrapolation of the curves shows the lack of reliability of the short-term secant rates. In the various tropical environments, 5% Al bronze had the best over-all corrosion resistance. alpha-Phase Cu-Zn corroded slightly faster than Cu in fresh water and somewhat less than Cu in other environments. The 60-40 alpha + beta brasses, with the exception of Mn bronze in fresh water, corroded considerable more than Cu in underwater exposures. Heavy dezincification occurred in the alpha + beta brasses in sea water. Moderate dezincification was evident in the duplex brasses in fresh water and marine atmosphere exposures. Small additions of As, Sn, and Mn were ineffective in inhibiting marine dezincification of high brasses. Tensile data generally show weight losses for the high Cu Alloy, and heavy dezincification in the duplex brasses with penetrations 2.2 to 5.5 times that shown by weight logs for the sea-water exposures. Corrosion of phosphor bronze and naval brass was galvanically accelerated 42 and 24% when coupled with 1/7 area strips of type 316 stainless steel. Efficient cathodic protection of bronze and brass was provided by C Steel anodes for periods of 8-12 years. Cu and its alloys showed varying fouling resistance in the bioactive tropical waters. Marine fouling collected directly on Cu panels when the corrosion rate of the Cu was too low to provide an effective Cu ion concentration. Galvanically protected Cu metals, including dezincified surfaces, were moderately to heavily covered at the 2 year inspection. Plates of Cu and high-Cu alloys showed decreasing fouling resistance with exposure time and all were heavily covered at 16 years. Corrosion of all Cu metals was very low in the tropical atmosphere, and they are considered excellent for this environment. All bronze and the Cu Zn alloys cored linearly with time after 1 or 2 years exposure in the atmosphere.

13 citations

Journal Article
Abstract: THOUGH CATHODIC PROTECTION OF STEEL IN CONCRETE IS NORMALLY NOT REQUIRED, ITS APPLICATION TO REINFORCED CONCRETE STRUCTURES IS SOMETIMES JUSTIFIED TO PREVENT OR ARREST CORROSION IN HIGH CHLORIDE ENVIRONMENTS. IN SUCH CASES, THE PASSIVATING EFFECT OF PORTLAND CEMENT SHOULD BE RECOGNIZED, AND, AS ILLUSTRATED BY THE EXPERIMENTS REPORTED IN THIS PAPER, THE CRITERIA FOR CATHODIC PROTECTION OF REINFORCED CONCRETE STRUCTURES ARE ENTIRELY DIFFERENT FROM THOSE FOR BARE OR ORGANICALLY COATED STEEL STRUCTURES. /MP/

13 citations

Journal Article
Abstract: ALTHOUGH BOTH FIELD AND LABORATORY STUDIES HAVE CORRELATED STEEL CORROSION WITH ATMOSPHERIC SULFUR DIOXIDE CONCENTRATION, AND THE REACTION MECHANISM HAS BEEN SUFFICIENTLY STUDIED TO ESTABLISH A DEFINITE CAUSE--EFFECT RELATIONSHIP, UNEXPLAINED SITE-TO-SITE AND SEASON-TO-SEASON VARIATIONS HAVE LED TO THE CONCLUSION THAT UNMEASURED VARIABLES ALSO CONTRIBUTE TO STEEL CORROSION. ONE APPROACH IS TO MEASURE THE CORROSIVENESS AT EACH SITE. ANOTHER, ADOPTED IN THE PRESENT STUDY, IS TO DETERMINE THE IDENTITY OF THESE UNMEASURED VARIABLES AND THE EXTENT OF THEIR EFFECTS. THE EXPERIMENTAL DATA ARE DRAWN FROM THE CONTINUOUS AIR MONITORING PROJECT (CAMP) THAT THE PUBLIC HEALTH SERVICE HAS MAINTAINED IN EIGHT LARGE CITIES AROUND THE COUNTRY SINCE 1961. THE EXPERIMENTAL PROCEDURE AND ANALYTIC EQUATIONS ARE DESCRIBED. IT IS CONCLUDED THAT MORE THAN 90% OF THE VARIABILITY IN CORROSION BEHAVIOR OF THREE TYPES OF STEEL EXPOSED AT URBAN SITES IN THE EIGHT CITIES CAN BE ACCOUNTED FOR BY THE VARIABILITY OF CONCENTRATIONS OF TWO POLLUTANTS: SULFUR DIOXIDE INCREASES CORROSION AND OXIDANTS DECREASE IT. WHILE THE EFFECT OF THE FORMER HAS BEEN OBSERVED MANY TIMES IN THE PAST, THE EFFECT OF THE LATTER IS A NEW OBSERVATION. BECAUSE THE TWO EFFECTS ARE COUNTERACTING, THE RELATIVE RATES BY WHICH THE POLLUTANTS ARE REDUCED IN THE FUTURE WILL STRONGLY AFFECT THE CORROSION BEHAVIOR OF STEELS.

11 citations

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Performance
Metrics
No. of papers from the Journal in previous years
YearPapers
20212
20155
20149
201311
201211
201122