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The study objective was to evaluate the cost effectiveness and feasibility of a paint system warranty from a coatings manufacturer for a specified coating to be applied over steel with minimum surface preparation (without removing completely the existing coating or tightly adhering rust) and to evaluate the coating performance at the conclusion of the warranty period.
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Painting contractors are frequently forced to contractually obligate their Commercial General Liability Coverage (CGLC), onto Building Owners (BO), and/or General Contactors (GC). A typical scenario occurs when a painting contractor bids a project and enter into contractual obligations without fully realizing what their contractual obligations are within the job they just bid and won.
Painted aluminum extrusions are a common architectural material used in the manufacture of windows and door frames. The applied coatings, typically in a shop atmosphere, may not always work once installed in the field due to a variety of fabrication defects and or exposures.
Corrosion is a natural phenomenon, and thus can never be completely eliminated; however, it is a misconception nothing can be done. Estimates show 25-30% of steel corrosion could be eliminated if proper corrosion protection methods were employed. Corrosion can simplistically be viewed as the tendency for the metal, after production and shaping, to revert back to its lower, more natural energy state of ore. This tendency is known as the Law of Entropy.
Duplex systems, also known as painting over hot dip galvanized steel, are extremely effective corrosion protection systems. However, careful surface preparation techniques need to be used to alleviate potential coating failures. The age and characteristics of the galvanized coating should be used to determine what type of surface preparation is needed.
Floating production storage offloading (FPSO) system hulls physically resemble ocean going transport vessels but operate more like fixed offshore structures. FPSOs normally are moored in deep water and are connected to unique riser systems. As these production systems are typically designed for long life, 20 to 30 years, corrosion control of the hull is extremely critical to help assure the required performance is obtained.
Until a few years ago, water tanks were always drained before exterior surfaces were painted because surface moisture, if found below the water line, would lead to a coating failure. But a coating technology borrowed from the bridge and highway industry and put to a new use is bringing changes to the water tank marketplace. This presentation introduces the original project, includes the coating evaluation after 6 years, and concludes with additional tank examples.
Well-formulated fluorocarbon paints can last for decades, but when repair is needed or a color change is desired, it can sometimes be a challenge to choose the right coating system to use on top of the fluorocarbon. This presentation will discuss new VOC-compliant options that have become available which not only stick to fluorocarbon paints, but also offer a quantum improvement in color fade resistance.
This work evaluates the suitability of lignin as corrosion inhibitor when AISI 1080 carbon steel coupons were used as tests specimens. A stock solution of lignin powder provided by an Albertan Pulp and Paper mill company was tested for its inhibition efficiency in Rotating Cylinder Electrode (RCE) system according to ASTM G185-06. The testing environment consisted on modelled brackish water at temperatures varying between 30°C - 85°C and pH=6 to 8.The corrosion rates of the test specimens calculated by both linear polarization resistance (LPR) and weight loss methods indicated optimum lignin performance was achieved for all range of temperature tested when pH=6. For this case the lignin based solution reduced the corrosion rate by more than 90% compared to the baseline corrosion rate measurement.The corrosion potential of the baseline test specimens were < -700 mV (more negative) and became more positive after lignin was added to the model brackish water system indicating corrosion severity of the test medium in the absence of this bio-based inhibitor. Optical imaging of the corrosion coupons after all tests showed no significant general corrosion and pitting in those test conditions compared to the baseline specimens.This work evaluates the suitability of lignin as corrosion inhibitor when AISI 1080 carbon steel coupons were used as tests specimens. A stock solution of lignin powder provided by an Albertan Pulp and Paper mill company was tested for its inhibition efficiency in Rotating Cylinder Electrode (RCE) system according to ASTM G185-06. The testing environment consisted on modelled brackish water at temperatures varying between 30°C - 85°C and pH=6 to 8.The corrosion rates of the test specimens calculated by both linear polarization resistance (LPR) and weight loss methods indicated optimum lignin performance was achieved for all range of temperature tested when pH=6. For this case the lignin based solution reduced the corrosion rate by more than 90% compared to the baseline corrosion rate measurement.The corrosion potential of the baseline test specimens were < -700 mV (more negative) and became more positive after lignin was added to the model brackish water system indicating corrosion severity of the test medium in the absence of this bio-based inhibitor. Optical imaging of the corrosion coupons after all tests showed no significant general corrosion and pitting in those test conditions compared to the baseline specimens.
The NSRP Surface Preparation and Coatings panel sponsored a project to reduce the extent of abrasive blasting to remove aged, ultra-high solids coatings from tanks and other spaces on Navy ships. This “partial blast” process allows a percentage of remaining serviceable Ultra High Solids (UHS) to remain. After surface preparation, a single coat application of UHS coating is applied to all surfaces.
The Society for Preventive Coatings (SSPC) has been an essential partner with the Department of Defense in the fight against corrosion for nearly 10 years. Since 2003, SSPC’s leadership and expertise in corrosion management, prevention and control has been a very important factor in our success at combating the insidious and pervasive effects of corrosion on our facilities and equipment.