Kata Pengantar
ISO (Organisasi Internasional untuk Standardisasi) adalah aliansi global badan standar nasional (badan anggota ISO). Pengembangan standar internasional biasanya dilakukan melalui komite teknis ISO. Setiap lembaga anggota yang berminat pada suatu mata pelajaran yang telah dibentuk panitia teknisnya berhak untuk diwakili dalam panitia tersebut. Organisasi internasional pemerintah dan non-pemerintah yang berhubungan dengan organisasi standardisasi juga terlibat dalam pekerjaan ini. ISO bekerja sama dengan Komisi Elektroteknik Internasional (IEC) tentang segala hal standardisasi kelistrikan.

Standar internasional disusun berdasarkan aturan yang diberikan di Bagian 2 dari Petunjuk ISO/IEC.

Tugas utama komite teknis adalah mengembangkan standar internasional. Rancangan standar internasional yang diadopsi oleh Komite Teknis akan diedarkan ke badan-badan anggota untuk pemungutan suara. Publikasi sebagai standar internasional memerlukan persetujuan paling sedikit 75% dari lembaga-lembaga anggota.

Harap dicatat bahwa isi tertentu dari dokumen ini mungkin memiliki hak paten. ISO tidak bertanggung jawab untuk mengidentifikasi salah satu atau seluruh hak paten tersebut.

ISO 4628-8 dikembangkan oleh Komite Teknis ISO/TC 35, Cat dan pernis, Subkomite SC 9, Metode pengujian umum untuk cat dan pernis.

Edisi kedua membatalkan dan menggantikan edisi pertama (ISO 4628-8:2005). For this revision:

A) The use of measurements and calculations to determine delamination and corrosion is preferable to the use of graphical standards;

B) Introduce artificial defects whose shapes are not linear crossed marks.

ISO 4628 consists of the following sections under the general heading Paints and varnishments – Penilaian degradasi lapisan – designation of the number and size of defects, and the intensity of uniform changes in appearance:

— Bagian 1: General introduction and specifying the system

— Bagian 2: Penilaian tingkat busa

— Bagian 3: Assessment of the degree of rust

Bagian 4: Evaluation of the degree of cracking

— Bagian 5: Penilaian tingkat pengelupasan

— Bagian 6: Assessing the degree of chalking by the tape method

— Bagian 7: Assessing the degree of chalking by the velvet method

— Bagian 8: Assessing the degree of delamination and corrosion around marking or other artificial defects

— Bagian 10: Penilaian tingkat korosi filamen

ISO 4628-8-2012 – Penilaian penuaan pernis dan pelapis pernis – Penilaian jumlah dan ukuran cacat serta intensitas perubahan penampilan yang seragam – Bagian 8: Penilaian tingkat pengupasan dan korosi di sekitar goresan

Perkenalan
ISO 4628-1[1] defines a system for specifying the number and size of defects and the intensity of uniform variations in coating appearance and Outlines the general principles of this system. The system is particularly suitable for defects caused by aging and weathering, as well as uniform changes, such as color changes, such as yellowing.

Other parts of ISO 4628 provide graphical standards or other methods for assessing specific types of defects. Build on existing evaluation plans whenever possible.

After exposure to a coated test board with strewn or other artificial defects in a corrosive environment, one or a combination of the strewn or other artificial defects, the following phenomena may occur around the strewn or other artificial defects:

– stratification;

— Corrosion.

Delamination and corrosion or other man-made defects around the streamer will be evaluated separately to provide more detailed information about the performance of the coating system in a corrosive environment.

In addition to the procedures specified in this part of ISO 4628, it is possible to use optical image processing to evaluate delimitation and corrosion around scratches or other artificial defects.

The rating of other defects is described elsewhere in ISO 4628.

ISO 4628-8-2012 – Penilaian penuaan pernis dan pelapis pernis – Penilaian jumlah dan ukuran cacat serta intensitas perubahan penampilan yang seragam – Bagian 8: Penilaian tingkat pengupasan dan korosi di sekitar goresan

1 Cakupan
Bagian dari ISO ini 4628 specifies a method for assessing delamination and corrosion around strewn lines or other man-made defects on coated panels or other coated specimens caused by a corrosive environment.

Bagian dari ISO ini 4628 does not include an assessment of pitting erosion or pit depth.

Catatan 1 Examples of corrosive environments are artificial atmoses such as salt spray used in the test method specified in ISO 9227 [7] and seawater immersion used in the test method specified in ISO 15711. [8] Natural environments can also be used.

Catatan 2 The extent of other defects can also be determined in conjunction with delamination and corrosion. The method is as follows:

– Foaming according to ISO 4628-2 standar; [2]

– rust according to ISO 4628-3; [3]

– cracking meets ISO 4628-4 standar; [4]

– peeling according to ISO 4628-5 standar; [5]

– Filamentation corrosion in accordance with ISO 4628-10 standar. [6]

2 Acuan normatif
Referensi berikut diperlukan untuk penerapan dokumen ini. Untuk referensi bertanggal, hanya versi yang dikutip yang berlaku. Untuk referensi tidak bertanggal, referensi versi baru (termasuk revisi apa pun) berlaku.

ISO 3270, Cat dan pernis serta bahan bakunya – suhu dan kelembaban diatur dan diuji

ISO 4628-8-2012 – Penilaian penuaan pernis dan pelapis pernis – Penilaian jumlah dan ukuran cacat serta intensitas perubahan penampilan yang seragam – Bagian 8: Penilaian tingkat pengupasan dan korosi di sekitar goresan

3 Istilah dan definisi
Untuk keperluan dokumen ini, istilah dan definisi berikut berlaku.

3.1 Leakage coating

There is no paint film in some areas of the coated substrate

3.2 Artificial defects

By coating, it is deliberately introduced in order to expose the underlying metal substrate before exposure to a corrosive environment

3.3 Circular defect

By coating the circular holiday, deliberately introduced in order to expose the underlying metal substrate prior to exposure to the corrosive environment

3.4 Corrosion area

The area around the defect where the substrate is corroded

3.5 Layered Regions

The area around the defect where the coating loses adhesion to the substrate or the underlying coating

3.6 Scribes

Deliberately introduced through a linear leakage of the coating in order to expose the underlying metal substrate prior to exposure to a corrosive environment

Hanya komponen informasi standar yang tersedia untuk umum. Untuk melihat konten selengkapnya, Anda harus membeli standar melalui jalur formal.