Isang Paunang Salita
ISO (International Organization para sa Standardisasyon) ay isang pandaigdigang alyansa ng mga pambansang pamantayan katawan (Mga katawan ng miyembro ng ISO). Ang pagbuo ng mga internasyonal na pamantayan ay karaniwang isinasagawa sa pamamagitan ng ISO teknikal na komite. Ang bawat institusyon ng miyembro na interesado sa isang paksa kung saan ang isang teknikal na komite ay itinatag ay may karapatang kumatawan sa komite. Ang pamahalaan at mga di pampamahalaang internasyonal na organisasyon na nakikipag ugnayan sa mga organisasyon ng standardization ay kasangkot din sa gawaing ito. ISO ay gumagana nang malapit sa International Electrotechnical Commission (IEC) sa lahat ng bagay ng electrical standardization.

International standards are drafted according to the rules given in Part 2 ng Direktiba ng ISO / IEC.

Ang pangunahing tungkulin ng komite ng teknikal ay upang bumuo ng mga internasyonal na pamantayan. Draft international standards adopted by the Technical Committee will be circulated to member bodies for voting. Ang paglalathala bilang isang internasyonal na pamantayan ay nangangailangan ng pag apruba ng hindi bababa sa 75% ng mga miyembrong institusyon.

Mangyaring tandaan na ang ilang mga nilalaman ng dokumentong ito ay maaaring sumailalim sa mga karapatan sa patent. ISO ay hindi responsable para sa pagtukoy ng anumang o lahat ng naturang mga karapatan sa patent.

ISO 4628-8 was developed by Technical Committee ISO/TC 35, Mga pintura at barnis, Subcommittee SC 9, General test methods for paints and varnishes.

Ang ikalawang edisyon ay kinakansela at pinalitan ang unang edisyon (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 – Assessment of coating degradation – designation of the number and size of defects, and the intensity of uniform changes in appearance:

— Bahagi 1: General introduction and specifying the system

— Bahagi 2: Assessment of the degree of foaming

— Bahagi 3: Assessment of the degree of rust

Bahagi 4: Evaluation of the degree of cracking

— Bahagi 5: Assessment of the degree of peeling

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

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

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

— Bahagi 10: Assessment of the degree of filamentous corrosion

ISO 4628-8-2012 – Pagtatasa ng pag iipon ng lacquers at varnish coatings – Pagtatasa ng bilang at laki ng mga depekto at ang intensity ng unipormeng mga pagbabago sa hitsura – Bahagi 8: Pagtatasa ng antas ng paghubad at kaagnasan sa paligid ng mga gasgas

Panimula
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;

— Kaagnasan.

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 – Pagtatasa ng pag iipon ng lacquers at varnish coatings – Pagtatasa ng bilang at laki ng mga depekto at ang intensity ng unipormeng mga pagbabago sa hitsura – Bahagi 8: Pagtatasa ng antas ng paghubad at kaagnasan sa paligid ng mga gasgas

1 Saklaw
Ang bahaging ito ng ISO 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.

Ang bahaging ito ng ISO 4628 does not include an assessment of pitting erosion or pit depth.

Tala 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.

Tala 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 pamantayan; [2]

– rust according to ISO 4628-3; [3]

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

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

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

2 Mga reperensyang normatibo
The following references are required for the application of this document. Para sa mga petsang sanggunian, ang binanggit na bersyon lamang ang nalalapat. Para sa mga walang petsang sanggunian, ang bagong bersyon ng sanggunian (kasama ang anumang mga rebisyon) angkop.

ISO 3270, Paints and varnishes and their raw materials – temperature and humidity regulated and tested

ISO 4628-8-2012 – Pagtatasa ng pag iipon ng lacquers at varnish coatings – Pagtatasa ng bilang at laki ng mga depekto at ang intensity ng unipormeng mga pagbabago sa hitsura – Bahagi 8: Pagtatasa ng antas ng paghubad at kaagnasan sa paligid ng mga gasgas

3 Mga tuntunin at kahulugan
Para sa mga layunin ng dokumentong ito, Ang mga sumusunod na termino at kahulugan ay nalalapat.

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

Tanging ang karaniwang bahagi ng impormasyon ay magagamit sa publiko. Upang makita ang buong nilalaman, Kakailanganin mong bilhin ang mga pamantayan sa pamamagitan ng mga pormal na channel.