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Rochester Hills, MI, United States

Barnes D.J.,Elcometer
Corrosion Management | Year: 2015

Pull-off adhesion testing is widely used tassess the protective coating process and to determine if a coating is fit for service in new construction and for repairs to existing structures. The result is often critical to the acceptance or rejection of a coating process, as the adhesion value quoted by the paint manufacturer can be adversely affected by aspects of the coating process. Low adhesion values are indicative of premature failure of the coating and are often due to inadequate surface preparation of the substrate. ASTM D4541 and BS EN ISO 4624 describe several different test apparatus; however, the basic approach of gluing a test dolly to the coated surface and then exerting a perpendicular force to the surface in an effort to remove both the dolly and the coating from the substrate is common to all these standards. A measure of the adhesion of the coating system is the force at which the coating fails and the type of failure obtained. Trials have demonstrated that many aspects of the testing method, such as the mixing of the glue, the preparation of the coating surface and the face of the dolly and the temperature of the test, all affect the results.This paper will investigate the effects of any deviation from the proscribed method in every aspect of the test. Each aspect is examined in turn, the results tabulated and the potential effect on a valid adhesion test result is discussed. Source


Fletcher J.F.,Elcometer
NACE - International Corrosion Conference Series | Year: 2015

Contamination of blast cleaned steel surfaces prior to application of protective coatings leads to premature coating failure resulting from corrosion. It has become common practice to include a salt contamination test prior to the application of the first coat to ensure the required cleanliness. One simple and quick method for this test is the Saturated Filter Paper Method for extracting the salts from the surface with a conductivity meter to assess the resulting sample to determine the concentration of the soluble salts. This method is described in SSPC(1) Guide 15. Testing using this method has shown that soluble salts, particularly sodium chloride crystals, do not spread evenly over a surface and therefore the area tested and the number of tests in a given area are significant in determining if the blasted surface is clean in respect of soluble salts. This paper will discuss the advantages inherent in the saturated paper method compared to other extraction methods and describe how the soluble salt contamination over a significant area can be determined. Reference will be made to the possibility of developing a reference test surface doped with a known concentration of sodium chloride so that the accuracy of testing can be verified. © 2015 by Nace International. Source


Fletcher J.,Elcometer
PPCJ Polymers Paint Colour Journal | Year: 2014

The Elcometer 130 salt contamination meter uses the saturate filter paper extraction method to create a test sample on the blast cleaned surface prior to the application of the coating and a conductivity meter to determine the soluble salt concentration in the filter paper. The design of the contamination meter for the filter paper extraction method is based on a microprocessor electronic circuit and has been developed with features to make the assessment of surface contamination by soluble salt efficient, reliable and user friendly. It has large color display, clear menu structure and large buttons. It stores up to 150,000 individual readings in up to 2500 batch memories with alpha-numeric identification and data output, via USM and Bluetooth. The Elcometer 130 is supplied complete with the Elcometer 2.0 software for simple and efficient data management for a range of coating inspection instruments. It is also supplied with Elcomaster Mobile, which has versions for I-pad, I-phone and Android phones. As each filter paper is allowed to extract salt from the surface for about two minutes, it is possible to put a number of filter papers on a large surface. Source


Fletcher J.,Elcometer
PPCJ Polymers Paint Colour Journal | Year: 2014

John Fletcher from Elcometer discusses two tests, which can assess the viability of paints after an application has been coated. Two types of apparatus are specified, with type 1 being appropriate for use on test panels of thickness up to 0.3mm and type 2 for use on test panels of thickness up to 1.0mm. These two types of apparatus have been found to give similar results with the same coating but normally only one will be used for testing a given product. The Conical Mandrel Bend Tester consists of a frame with a bending lever with a roller to bend test panels over a cone, which is mounted on a base plate. The coated test panel is bent manually over one or more cylindrical rods of different diameters for this test. The testers have two forms, such as a set of cylindrical mandrels on a stand or a frame with a roller to bend the test panel over a holder that can accommodate any of the set of cylindrical mandrels from 2-32mm. Source


Patent
Elcometer | Date: 2013-10-09

A measuring instrument, such as a coating thickness measuring instrument, comprises a reader (

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