By D.A. Bayliss, D.H. Deacon
Simple consultant to the foundations concerned and strategies of attaining sound metal security.
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Additional info for Steelwork Corrosion Control
In these tests copper slag was unsatisfactory and silica sand was satisfactory but, particularly for the latter, there are a wide range of materials with different properties that could give different results. In works situations the steel may be cleaned in a cabinet, so containing the spread of abrasive. However, on-site the abrasive is not usually contained within the immediate confines of the machine. g. tarpaulins, are frequently used to 22 STEELWORK CORROSION CONTROL Fig. 6. Diagram of vacuum recovery system (Reproduced by permission of Hodge Clemco).
The Steel Structures Painting Council (SSPC) have reported,15 that the use of non-metallic abrasives results in consistently good coating performance equal to or better than that obtained with metallic abrasives. Non-metallic abrasives are less liable to raise spikes or minute laminations, generally known as hackles, on the metal surface. They are, however, more likely to remain embedded in the clean surface, typically to the extent of over 106 particles per square metre. Providing such particles do not contain corrosion-promoting substances such as chlorides, there is no evidence that such embedded particles affect the subsequent coating performance.
When inhibitors are used in the water it is important that they are added in controlled amounts since concentrations left on the cleaned surface will result in water-soluble salt contamination. The inhibitors can be added in the required concentration to water held in the storage tanks for the equipment or they can be dosed by measured amounts into the blast unit itself. A number of proprietary inhibitors have been used for this purpose, but those based on polyphosphates appear to be the most suitable.