ISO 22553-10:2022 pdf – Paints and varnishes — Electro-deposition coatings — Part 10: Edge protection

ISO 22553-10:2022 pdf – Paints and varnishes — Electro-deposition coatings — Part 10: Edge protection.
1 Scope This document specifies a test method for the evaluation of protection against corrosion of edges and stamping burrs by electro-deposition coatings. It applies to electro-deposition coatings for automotive industries and other general industrial applications, e.g. chiller units, consumer products, radiators, aerospace, agriculture. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 1514, Paints and varnishes — Standard panels for testing ISO 2808, Paints and varnishes — Determination of film thickness ISO 4618, Paints and varnishes — Terms and definitions ISO 4628-1, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 1: General introduction and designation system ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests ISO 11997-1:2017, Paints and varnishes — Determination of resistance to cyclic corrosion conditions — Part 1: Wet (salt fog)/dry/humid ISO 11997-3 1) ,Paints and varnishes — Determination of resistance to cyclic corrosion conditions — Part 3: Testing of coating systems on materials and components in automotive construction ISO 13076, Paints and varnishes — Lighting and procedure for visual assessments of coatings ISO 22553-1, Paints and varnishes — Electro-deposition coatings — Part 1: Vocabulary ISO 23321, Solvents for paints and varnishes — Demineralized water for industrial applications — Specification and test methods 3? Terms? and? definitions For the purposes of this document, the terms and definitions given in ISO 4618, ISO 22553-1 and the following apply.
5.4 Oven, in which the test can be carried out safely and in which the specified or agreed test temperature can be held to within ±2 °C (for temperatures up to 150 °C) or ±3,5 °C (for temperatures between 150 °C and 200 °C). 6 Test panels Use electrically conductive test panels with pre-treatment as specified in ISO 1514 with dimensions of about 190 mm × 105 mm × 0,75 mm. Five holes with a diameter of 20 mm and a stamping burr of about 90° are stamped into the test panel. The side with the stamping burr shall be marked. NOTE 1 The height and the roughness of the burrs on the backside of the holes could have an impact on the corrosion. The test panels are pre-treated in accordance with the product specification of the electro-deposition coating material (e-coat). NOTE 2 Experience has shown that holes prepared by laser cutting lead to different test results compared to stamped holes. An internal comparison with holes prepared by laser cutting has shown results with poorer reproducibility data. An example for a test panel is shown in Figure 2.
8 Procedure 8.1 Coating of the test panels Fill the tank with the electro-deposition coating material up to about 1 cm below the upper part of the tank and homogenize the coating material, e.g. using a stirring machine with paddle stirrer (minimum diameter 50 mm) at 500 min −1 , so that sufficient tank circulation is visually detectable. Immerse the test panel in the laboratory deposition system and connect the anode and cathode to the current source. Maintain stirring of the electro-deposition coating material with a stirring machine or a magnet stirrer. Set the bath temperature to the temperature specifically required for the product to ±0,5 °C. NOTE 1 Usually the temperature is in the range from 25 °C to 35 °C. Select the deposition voltage and deposition time so that the expected dry film thickness of the electro- deposition coating on the test panel corresponds to the nominal dry film thickness. Increase the voltage to the selected coating voltage (if necessary without series resistor). Maintain that voltage over the selected time. After completion of the deposition process, remove the coated test panel from the tank. Rinse it thoroughly using demineralized water specified in ISO 23321, so that any excess of the electro- deposition coating material (cream coat) is removed. Stove the electro-deposition coating in accordance with its specifications. The stoving temperature shall be the object temperature, not the indicated oven temperature.