The ISO 4623-1:2018 standard describes test procedures for evaluating the effectiveness of coatings on steel substrates for protection against filamentous corrosion. The standard provides an evaluation method for filamentous corrosion induced from scribe marks, which is suitable for testing the corrosion performance of coatings under specific environment conditions. The new version has been revised from the previous version, including the introduction of new references and updated test conditions to ensure the accuracy and Reliability of evaluation results.