Abstract
Pulsed thermography is a common technique for nondestructive testing (NDT) of materials. This study presents the apparent effusivity method for the quantitative evaluation of coating thickness in a one-sided thermal NDT procedure. The proposed algorithm is based on determining a threshold value of apparent effusivity, which can be found for particular coating-on-substrate structures. It has been found that the square root of the time at which the apparent effusivity curve reaches this threshold is proportional to the coating thickness. The efficiency of the proposed approach is demonstrated by analytical modeling and experimentation performed on thermally-sprayed coatings.
Highlights
IntroductionCoatings are covering layers that are applied to the surface of materials, called substrates
Coatings are covering layers that are applied to the surface of materials, called substrates.Various kinds of coatings are widely used for restoration and enhancement of the lifetime of metallic constructions by protecting them from corrosion and wear [1,2]
× 50inmask in each area d1–d8 and processed by applying for the calculation of apparent effusivity corresponding linear dependence can be used for the determination of both coating thickness and its coating area d1–d8 and processed by applying Equation (5) for the calculation of apparent effusivity evolutions
Summary
Coatings are covering layers that are applied to the surface of materials, called substrates. Various kinds of coatings are widely used for restoration and enhancement of the lifetime of metallic constructions by protecting them from corrosion and wear [1,2]. Coatings are differed by purposes, materials, and application procedures. Coating thickness is an important parameter used for the evaluation of coating quality and service life. Nondestructive testing (NDT) methods allowing determination of coating thickness are required in the manufacture and operation of materials with coatings. Coating thickness can be evaluated by using numerous NDT techniques, such as eddy-current, X-ray, ultrasound, Terahertz, etc. The eddy-current and ultrasound methods are precise but require contact with materials to be tested and calibration on many test samples. Terahertz testing is time-consuming and requires expensive equipment
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