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Sheet coating thickness

Vast amounts of continuously galvanised steel sheets are produced, and unless they are painted or otherwise coated, their life depends on the thickness of the galvanising and the service environment in which they are used. Similarly in the case of steel sheets coated with aluminium or aluminium-zinc alloys, their performance is dictated by their coating thickness (see Section 13.4). A problem often associated with such material is corrosion at the cut edges. From work carried out by BISRA and others it has been shown that providing the bare steel edge is less than 3 mm in width, the amount of corrosion is minimal and the life of the sheet is not adversely... [Pg.47]

Hot Dipped Coatings Major attempts have been made to improve the quality of aluminised steel strip. Requirements on coating thickness and uniformity have been imposed. It is the speed of sheet movement, length of path in the molten bath, temperature and composition of the bath that control the thickness of the intermetallic layer which lies below the aluminium outer surface. The process of intermetallic alloy formation is diffusion controlled, and it is usual that some dissolution of iron into the molten aluminium does occur at a rate, Ac/At, which is given by... [Pg.477]

Sample Preparation. The sample series was prepared by varying the ratio of Epon 828 to the methylene dlaniline (MDA) curing agent. The compositions tested contained 0%, 23.1%, 50.0% and 100% excess MDA over the stoichiometric amount. The MDA and diepoxide were heated to 100°C and mixed. The mixture was cast onto one side of a sheet of aluminum 5.5 cm. x 24.5 cm. x 5 mils, which had first been wiped with acetone to degrease the bonding surface. The final coating thickness was controlled at approximately 60 mils. [Pg.223]

Average coating thickness, 121 rim bOriginal soil identification Sheet specimens... [Pg.288]

The experiments should be carefiilly performed to avoid confusing internal and external mass transfer resistances. A dedicated reactor should probably be desigiied. It could be a continuous stirred tank reactor (mechanical stirring) containing a sheet of wash-coated substrate. If the rate of reaction depends on the wash-coat thickness, and not on stirring speed, then internal diffiision resistance prevails. [Pg.67]

Eddy current testing Cracks, and variations in alloy composition or heat treatment, wall thickness, dimensions Tubing, local regions of sheet metal, alloy sorting, and coating thickness measurement Moderate cost, readily automated portable Detects flaws that change in conductivity of metals shallow penetration geometry-sensitive... [Pg.860]


See other pages where Sheet coating thickness is mentioned: [Pg.312]    [Pg.1392]    [Pg.312]    [Pg.1392]    [Pg.132]    [Pg.126]    [Pg.209]    [Pg.385]    [Pg.385]    [Pg.487]    [Pg.488]    [Pg.503]    [Pg.557]    [Pg.182]    [Pg.349]    [Pg.190]    [Pg.28]    [Pg.126]    [Pg.209]    [Pg.1224]    [Pg.237]    [Pg.201]    [Pg.382]    [Pg.126]    [Pg.202]    [Pg.1822]    [Pg.98]    [Pg.18]    [Pg.40]    [Pg.287]    [Pg.427]    [Pg.426]    [Pg.126]    [Pg.209]    [Pg.155]    [Pg.288]    [Pg.30]    [Pg.382]    [Pg.414]    [Pg.414]    [Pg.516]    [Pg.517]    [Pg.532]    [Pg.586]    [Pg.270]   
See also in sourсe #XX -- [ Pg.68 ]




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