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Corrosion is an unfortunate given in the oil and gas industry. The pipelines and vast infrastructure, some of which is over half a century old, is subject to corrosion. If that corrosion goes undetected, the results can be disastrous, and very costly. Only with proper attention to safeguards, maintenance and modern protective technologies can the world's oil supplies remain steady, and the environment safe from disaster. read the the full article.
2) SURFACE PRETREATMENT BY PHOSPHATE CONVERSION COATINGS A REVIEW - by T.S.N. Sankara Narayanan
Abstract. Phosphating is the most widely used metal pretreatment process for the surface
treatment and finishing of ferrous and non-ferrous metals. Due to its economy, speed of opera
tion and ability to afford excellent corrosion resistance, wear resistance, adhesion and lubricative
properties, it plays a significant role in the automobile, process and appliance industries. Though
the process was initially developed as a simple method of preventing corrosion, the changing
end uses of phosphated articles have forced the modification of the existing processes and
development of innovative methods to substitute the conventional ones. To keep pace with the
rapid changing need of the finishing systems, numerous modifications have been put forth in
their development - both in the processing sequence as well as in the phosphating formulations.
This review addresses the various aspects of phosphating in detail. In spite of the numerous modifications put forth on the deposition technologies to achieve different types of coatings and desirable properties such as improved corrosion resistance, wear resistance, etc., phosphate conversion coating still plays a vital part in the automobile, process and appliance industries. read the article
3) Dezincification of Brass in Sulfide Polluted Sodium Chloride Medium: Evaluation of the Effectiveness of 2-Mercaptobenzothiazole - by Satendra Kumar, T.S.N. Sankara Narayanan1*, M. Suresh Kumar2 and A. Manimaran
The present paper addresses the effectiveness of 2-mercaptobenzothiazole (MBT) in preventing the dezincification of brass in sulfide polluted 3.5% NaCl solution. The dezincification behaviour of brass in 3.5% NaCl solution containing 100-1000 ppm of sulfide ions and 1 x 10-6 to 1 x 10-3 M MBT was studied by potentiodynamic polarization, electrochemical impedance spectroscopy, current-time transient and accelerated leaching studies. The presence of sulfide ions in 3.5% NaCl solution has caused a significant increase in the extent of corrosion attack on brass. The inhibiting effect of MBT is markedly reduced in the presence of sulfide ions in the medium. The easy replacement of Cu-MBT complex by Cu2S film on the surface of brass is responsible for the inability of MBT to prevent corrosion attack in the presence of sulfide ions. The study concludes that the effectiveness of MBT in preventing the dezincification of brass is dependent on the concentration of the sulfide ions in the medium and the effectiveness is nullified at higher concentrations of sulfide ions. read the article
4) Corrosion Evaluation with 3D Metrology - Craig Leising - NANOVEA
Corrosion is responsible for millions of dollars in material loss every year. Iron, steel and many
other metals corrode during oxidation slowly causing the breakdown of the material surface.
Corrosion measurement is a quantitative method by which the rate of corrosion can be evaluated to provide control and prevention understanding. Interest in corrosion measurement covers a broad spectrum of technical approaches including acoustic, electrical & mechanical. Non-contact Profilometry is an alternative approach used to measure the corrosive rate and material loss by obtaining surface topography measurement at nanometer levels.
IMPORTANCE OF SURFACE METROLOGY INSPECTION FOR R&D AND QUALITY CONTROL
Surface measurement is vital to understanding and responding to corrosion and ultimately material failure. To control future integrity of a given material will depend upon quantifiable, reproducible and reliable measurement of corrosive rates and topography evaluation. Precise measurement and evaluation of corrosion characteristics, on a given material or existing structure, can lead to the best selection of material, protective coatings and or corrosion control measures. Nanovea 3D Non-Contact Profilometers utilize chromatic confocal technology with unmatched capability to measure rough corrosive surfaces. Where other techniques fail to provide reliable data, due to probe contact, surface variation, angle and reflectivity, Nanovea Profilometers succeed and now with portable capability.
In this application, the Nanovea JR25 (Portable Profilometer) is used to measure the surface of a metal sample before and after corrosion. Several surface parameters will automatically be calculated including the most common, Sa (average surface roughness). read the article