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Solvent-based acrylic carbon paint anodes were installed on the north approach spans of the Yaquina Bay Bridge (Newport OR) in 1985 and performed well after 15 years. Anodes were inexpensive and repairs easy. Depolarization potentials are consistently above 100 with long-term current densities around 2 mA/m 2. Bond strength remains adequate.
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A case history is described involving microbiologically influenced corrosion (MIC) of AISI Type 304L stainless steel piping failure after being in contact with untreated stagnant, low chloride potable water for nine months. Specialized microbiological analysis techniques, including scanning electron and optical cmicroscopy, were used in the failure analysis.
Laboratory exposure testing of carbon steel to water from different regions of the United States, with varying chemistries and chloride content. The results of chemical analyses conducted in the laboratory, including elemental analysis by SEM/EDS and analysis by x-ray diffraction are correlated to water chemistry.
AZ31 (UNS M11311) is a wrought magnesium alloy used in aerospace and automotive applications. In this work, KOH-based electrolytes were used to study the corrosion behavior of AZ31 alloy in highly alkaline environment. The effect of dopants and exposure time on pit initiation was studied via optical and scanning electron microscopy.
Urea–formaldehyde resin was applied to an epoxy coating. The UF resin effectively prevented the corrosive medium from further permeating through to the interface between coating and steel substrate and that the UF resin could significantly reinforce the corrosion protection property.
This study reviews the localized corrosion performance of corrosion-resistant alloys and high-temperatures alloys containing varying amount of Cr, Mo and W, using both quantitative and surface characterization techniques.
Several alternating current (AC) coupon test stations (CTS) located near AC power lines were investigated to assess the AC interference corrosion risk of the test coupons. Asstation consisted of two ½ inch (1.27 cm) diameter and 1received each AC test inch (2.54 cm) long carbon steel (CS ) coupons. Coupons are much larger than 1 cm 2 and current density measurements are not 100% relatable to the SP21424 or ISO 18086 criteria, since these refer to measurements on (typically) 1 cm2 . The current densities measured on the coupons in this study will underestimate the AC corrosion threat.
Internal corrosion of pipelines associated with oil and gas production and refinery has always been a challenge for corrosion engineers. Over the past decades, corrosion engineers have made significant progress in developing mitigation approaches to protect these carbon steel pipelines by using corrosion inhibitors (CIs), corrosion resistant materials, and various cleaning techniques. Among all these mitigation strategies, corrosion inhibitors are considered as the first choice in handling the internal corrosion of pipelines.
AC corrosion of structures under cathodic protection (CP) is a major concern for pipelines. This work investigates the effect of soil constituents - earth alkali elements Ca and Mg - believed to have a large influence on the precipitation of hydroxides and carbonates in front of a coating damage.
UNS N08800 alloy coupons were prepared, polished and oxidized in diluted steam at 540 ºC. Formation of carbon on the surface of the pre-oxidized samples was investigated by exposure to reducing, highly carburizing atmosphere (CO in Ar) at 20 bar and varying temperature (550- 750 ºC).
The manufacturing and field experience of high strength low alloy (HSLA) steel plates produced by Thermo-Mechanical Controlled Process (TMCP) are well defined in industry standards and literature. The TMCP method consists of a well-prescribed rolling pass schedule followed by accelerated cooling that leads to a fine-grain microstructure with the desired mechanical properties of the produced plates.Quite recently, this TMCP process resulted in detrimental local variations with hidden hardness variations on pipe ID, so-called Local hard Zones (LHZ).