1 Scope
This standard specifies the test method specific to cataphoretic coatings.
This standard is applicable to cathodic cataphoretic coatings and anodic cataphoretic coatings.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated reference, the latest edition (including all the amendments) applies.
GB/T 601-2002 Chemical Reagent - Preparations of Standard Volumetric Solutions
GB/T 1725-2007 Paints Varnishes and Plastics - Determination of Non-volatile-matter Content
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 9271-2008 Paints and Varnishes Standard Panels for Testing
GB/T 23989-2009 Determination for the Solvent Resistance of Coatings by Solvent Rubs
3 Preparation of Cataphoretic Coatings
3.1 Preparation of cataphoretic coating working solution
Prepare the cataphoretic coating working solution according to the preparation process provided by the product supplier. The preparation water shall meet the requirements of the tertiary water specified in GB/T 6682.
3.2 Substrate and substrate processing
Foreword i
1 Scope
2 Normative References
3 Preparation of Cataphoretic Coatings
4 Determination Method
4.1 Conductivity of Cataphoretic Coatings
4.2 pH Value
4.3 Throwing Power of Cataphoretic Coatings
4.3.1 Ford Box Method
4.3.2 4-panel Method
4.3.3 Glass Tube Method
4.3.4 Steel Tube Method A
4.3.5 Steel Tube Method B
4.4 Coulombic Efficiency of Cataphoretic Coating
4.5 Deposition of Cataphoretic Coating
4.6 Nonvolatile Matter
4.7 Ash Content
4.8 Pigment/Binder Ratio of Cataphoretic Coatings
4.9 Precipitability
4.10 Screenings
4.11 Heating Loss
4.12 Gel Fraction
4.13 MEQ
4.13.1 Determination of MEQ Value (Expressed by Working Solution)
4.13.2 Determination of MEQ Value (Expressed by Resin)
4.14 L-effect
4.15 Re-solubility
4.16 Breakdown Voltage
4.17 Curing Property
4.18 Solvent Content
Figure 1 Cataphoretic Device
Figure 2 Ford Box Test Device
Figure 3 4-panel Test Device
Figure 4 Coating Test plates Used in the 4-panel Method
Figure 5 Glass Tube Test Device
Figure 6 Test Device for Steel Tube Method A
Figure 7 Test Device for Steel Tube Method B
