Coating Adhesion Calculator
Calculate expected adhesion strength, test parameters, and quality requirements for coating systems
Test Method
Coating Adhesion Testing Guide
Problem Background
Coating adhesion is the fundamental property that determines how well a coating bonds to its substrate. Poor adhesion leads to coating failure, corrosion, and costly repairs. Adhesion testing is essential for quality control, specification compliance, and failure analysis in protective coating applications.
Various test methods exist to evaluate adhesion strength, each with specific applications, advantages, and limitations. The choice of test method depends on the coating system, substrate type, and intended service environment.
Calculation Principles
Our calculator uses industry-standard formulas to predict adhesion performance based on coating properties, substrate characteristics, and environmental factors. The calculation considers:
- • Base adhesion strength of the coating system
- • Substrate adhesion factor based on surface preparation
- • Environmental degradation factors
- • Test method difficulty and reliability coefficients
Operation Examples
Cross-Cut Test
Make parallel cuts through the coating to the substrate, then apply and remove adhesive tape. Evaluate the amount of coating removed according to ISO 2409 classification scale.
Pull-Off Test
Bond a dolly to the coating surface, then apply perpendicular tensile force until failure occurs. Measure the maximum force and calculate adhesion strength in MPa.
Tape Test
Apply pressure-sensitive tape to the coating surface, then remove at a controlled angle and rate. Evaluate adhesion based on the amount of coating removed.
Supplementary Information
Factors Affecting Adhesion
- • Surface preparation quality and cleanliness
- • Coating application conditions (temperature, humidity)
- • Cure time and temperature profile
- • Substrate contamination and surface energy
- • Primer compatibility and intercoat adhesion
Industry Standards
- • ISO 2409: Cross-cut test for paints and varnishes
- • ISO 4624: Pull-off test for adhesion of paints
- • ASTM D3359: Tape test for adhesion of coatings
- • ASTM D4541: Pull-off strength of coatings
- • ISO 12944: Protective paint systems for steel structures