ISO 4628-8-2012 pdf free download.Paints and varnishes – Evaluation of degradation of coatings – Designation of quantity and size of defects, and of intensity of uniform changes in appearance – Part 8: Assessment of degree of delamination and corrosion around a scribe or other artificial defect.
This part of Iso 4628 specifies a method for assessing delamination and corrosion around a scribe or other artificial defect on a coated panel or other coated test specimen, caused by a corrosive environment. This part of ISO 4628 does not cover evaluation of pitting corrosion or pit depth.
NOTE I Examples of corrosive environments are artiflc,al atmospheres such as salt spray, as used in the test method specified in ISO 9227.L’l and sea water immersion as used in the test method specified in ISO 15711 18J Natural environments can also be used.
NOTE 2 The extent of other defects can also be determined at the same time as delamination and corrosion. Methods are given as follows:
— blistering in accordance with ISO 4628.2;121
— rusting in accordance with ISO 4628-3:J
— cracking in accordance with ISO 4628 .4;141 flaking in accordance with ISO 4628-5;(J
— fillform corrosion In accordance with ISO 4628.10(6)
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 references, the latest edition of the referenced document (including any amendments) applies.
ISO 3270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning and testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 holiday
absence of a paint film from certain areas of a coated substrate
3.2 artificial defect
holiday through a coating. deliberately introduced in order to expose the underlying metal substrate prior to exposure to a corrosive environment
4 Principle
The delamination around a scribe or other artificial defect is assessed either directly at the end of the test period, immediately after removal of the test panel from a previous conditioning environment, or after conditioning for a specified period.
The corrosion around the scribe or other artificial defect is assessed either immediately after removal of the test panel from a previous conditioning environment or after removal of the coating.
Both the degree of delamination and the degree of corrosion are determined by measurement and calculation.
5 Procedure
5.1 General
The assessment of delamination shall be made immediately after removal of the panels from the conditioning environment (5.2.1) unless otherwise specified or agreed, in which case assessment may be made after a further conditioning period, during which adhesion might recover (5.2.2).
The assessment of corrosion may be made on the coated panel (5.3.1) or, if agreed or otherwise specified, after stripping off the coating (5.3.2).
If corrosion is to be assessed after stripping off the coating, this is carried out after any assessment of delamination.
Testing of at least three individual test panels is required unless otherwise specified or agreed.
5.2 Assessment of delamination
5.2.1 Directly at the end of the test period
Rinse the test panel with fresh tap water immediately after exposure, i.e. before the coating dries out, blow off residues of water from the surface using compressed air if necessary, and inspect for visible changes. Carefully remove loose coating using a knife blade held at an angle, positioning the blade at the coating/substrate interface and forcing the coating away from the substrate.
Depending upon the coating type and degree of delamination, some force might be necessary to remove the coating, but a boundary should be found where the coating becomes tightly adhered to the substrate, this being the limit of delamination. To be able to correctly determine where this boundary between weak and tight adhesion lies, it is necessary to assess the adhesion beyond the boundary.ISO 4628-8 pdf free download.
Tags: Paints and varnishes
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