This guide describes the use of reference photographs depicting the appearance of both previously unpainted and previously painted and partially rusted hot-rolled carbon steel prior to and after abrasive blast cleaning.
The reference photographs consist of a series of 1:1 (actual size) color photographs. The photographs were taken under controlled studio lighting designed to show the maximum detail possible.
Highlighted in the guide are five initial rust conditions before surface preparation, covering the rand from intact mill scale to rusted and pitted steel, as well as previously painted steel.
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SSPC-VIS 2 provides a method to evaluate the degree of rusting on painted steel (or iron) surfaces. The reference color photographs and corresponding black and white images, which depict the percentage of rusting given in the written specification, form part of the standard.
This standard quantifies the degree of rusting on painted steel surfaces with a zero to ten scale base on the percentage of visible rust present on the surface. Visible rust includes rust blisters and undercutting of the coating.
The rusting depicted in the photographs is not accompanied by blistering, but the photographs show staning associated with the rust.