CATEGORIES

    Coating Leak Detection

    Overview Knowledge Standards Terms
    Coating leak detection assesses the continuity of coatings using electrochemical or high-voltage spark methods. The principle is that when voltage is applied, an intact coating acts as an insulator with no current flow, whereas at damaged areas, current pathways or electrical sparks are generated. This method serves to locate defects such as pinholes and cracks that are invisible to the naked eye. It is applied for quality verification of industrial protective coatings, such as those on the inner walls of storage tanks and pipeline anti-corrosion layers.
    Selection
    When selecting, consider the conductivity of the test object: use the spark method for metal substrates and the wet sponge method for non-metal substrates. Match the detection voltage according to the coating thickness, using low voltage for thin coatings to avoid breakdown. Environmental explosion-proof requirements determine the equipment grade, with intrinsically safe types needed for flammable areas. Detection efficiency needs determine whether to use manual scanning or an automated system.
    type
    Coated Film thickness
    Voltage range

    Terms

    Paint pinhole detector
    Coating Spark Leak Detector
    Electric spark leak detector
    Wet Sponge Pinhole Leak Detector
    Pinhole Leak Detector
    Low-voltage spark leak detector
    Low Voltage Electric Spark Leak Detector
    Coating Pinhole Leak Detector
    DC Spark Leak Detector
    High voltage spark leak detector

    Standards

    Incoming GB/T 46747-2025
    Rapid Determination of Heavy Metal Elements in Furniture Coatings by X-ray Fluorescence Spectrometry
    Active GB/T 45593-2025
    Fine ceramics—Determination of the abrasion resistance of coatings by micro-scale abrasion test
    Active GB/T 6843-1986
    Method for determining the coating melting point of photographic materials
    Active GB/T 13448-2019
    Test methods for prepainted steel sheet and strip
    Active GB/T 40359-2021
    Timekeeping instruments—Photoluminescent deposits—Test methods and requirements
    Active GB/T 42261-2022
    Metallic and other inorganic coatings—Test method of cyclic heating for thermal-barrier coatings under temperature gradient
    Active GB/T 44335-2024
    Fine ceramics—Methods of test for coatings—Determination of internal stress in ceramic coatings by application of the Stoney formula
    Active GB/T 7790-2008
    Paints and varnishes - Determination of resistance to cathodic disbonding of coatings exposed to sea water
    Active GB/T 41954-2022
    Paints and varnishes—On-site test methods on quality assessment for interior wall coatings
    Active GB/T 30794-2014
    Determination of polyvinylidene fluoride (PVDF) content of hot-melt fluorocarbon resin coatings (dry film)—Dropping of the melting temperature
    Active GB/T 30789.3-2014
    Paints and varnishes—Evaluation of degradation of coatings—Designation of quantity and size of defects ,and of intensity of uniform changes in appearance—Part 3: Assessment of degree of rusting
    Active GB/T 9266-2009
    Determination of scrub resistance of film of architectural paints and coatings
    Active GB/T 23987-2009
    Paints and varnishes - Exposure of coatings to artificial weathering - Exposure to fluorescent UV lamps and water
    Active GB/T 30707-2014
    Testing method on adhesion of fine ceramic coatings―Scratching
    Active GB/T 22638.10-2016
    Test methods for aluminium and aluminium alloy foils—Part 10：Determination of mass per unit area (surface density) of coatings

    Articles

    Application of Linear Abrasion Tester in Testing Scratch Resistance of Printing Ink Coatings on Packaging
    This article introduces the principle, method, and application of the linear abrasion tester in testing the scratch resistance of packaging printing ink coatings.
    Key Operational Points of Solvent Resistance Tester in Evaluating Coating Chemical Resistance
    This article introduces the key operational points of the solvent rub resistance tester in evaluating the chemical resistance of coatings. The instrument simulates friction and chemical contact, recording the number of rubs before coating failure to assess performance.
    The Zahn cup is used for the daily inspection of the viscosity of electrophoretic paint bath solutions.
    This article introduces the application of the Zahn cup in daily inspections of the viscosity of electrophoretic paint bath solutions. The viscosity of electrophoretic paint affects coating quality, making daily inspections crucial. The Zahn cup is simple to operate, cost-effective, and suitable for rapid on-site measurements.
    High-temperature viscometer measures the flow behavior of powder coatings in the molten state.
    This article introduces the use of a high-temperature viscometer to measure the flow behavior of powder coatings in their molten state. Powder coatings need to melt and flow before curing, a process that directly affects the smoothness and performance of the coating.
    Salt spray aging test chamber for cyclic corrosion evaluation of coating weatherability.
    This article introduces the method of using a salt spray aging test chamber to conduct cyclic corrosion tests for evaluating the weather resistance of coatings.
    Application of Automatic Coating Machines in the Preparation of Ceramic Coatings for Lithium-Ion Battery Separators
    This article discusses the application of automatic film coating machines in the preparation of ceramic coatings for lithium battery separators. Traditional manual coating methods often result in uneven coatings, which can adversely affect battery performance.
    Application of Automatic Film Coating Machine in Waterproof Coating Finishing of Textiles
    Automatic film coating machines are used for waterproof coating finishing on textiles, enabling precise control of coating thickness, improving uniformity and production efficiency.
    Study on the Dispersion Uniformity of Blade Coating Machines in High-Load Electrode Slurry Coating
    This article investigates how to optimize the dispersion uniformity of coatings by adjusting process parameters when using a blade coater to handle high-load electrode slurries.
    Application of Laboratory Coating Machines in the Coating of Optical-Grade PET Anti-Reflection Coatings
    This article discusses the application of laboratory coating machines in the preparation of anti-reflective coatings on optical-grade PET substrates. By controlling parameters such as coating speed and gap, the coating machine enables precise adjustment of coating thickness, thereby enhancing light transmittance and reducing reflection.
    Application of Automatic Coating Machines in the Preparation of Ceramic Coatings for Lithium Battery Separators
    This article introduces the application of automatic coating machines in the preparation of ceramic coatings for lithium battery separators. Traditional
    Rotating Rubber Wheel Abrasion Tester for Determination of Coating Taber Abrasion Index
    This article introduces the method for determining the Taber abrasion resistance index of coatings using a rotating rubber wheel abrasion tester.
    Research on the Stepwise Curing Process of Coatings Using Multi-Stage Temperature Control Ovens
    This article investigates a novel process for achieving stepwise curing of coatings using a multi-stage temperature-controlled oven.
    Evaluation of Coating Adhesion Grade by Cross-Cut Tester Combined with Tape Method
    This article introduces the method of evaluating coating adhesion using a paint film cross-cut tester combined with the tape method.
    Cup Test Instrument for Coating Tests the Impact and Deformation Resistance of Coatings on Metal Substrates.
    This article introduces how the coating cupping tester measures the resistance to stamping deformation of coatings on metal substrates.
    T-bend tester for coatings is used to determine the T-bend grade of metal sheet coatings.
    This article introduces how the T-bend tester for paint films is used to evaluate the flexibility and adhesion of coatings on metal sheet surfaces.