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Laboratory pilot plant coil coating

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Describes a lab-scale coating unit with facilities for full- and half-reversal of direction of travel to simulate actual coil coating process. Graphs show how coating thickness varies with applied force (pressure) and line speed. Also plot of transverse electrical resistance of paint film vs. thickness

Laboratory Pulse Unit for Electrodeposition Studies

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78 105269 Russ. Construction of a lab-scale unit for PR is described.

Laboratory simulation of copper electroplating on mild steel bolts

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Not in fact a simulation but a Nigerian lab. trial investigating parameters in acid copper plating of fasteners, incl. effect of increased acid conc'n on anode polarisation. Abstr only

Laboratory Studies for Removing Sludge from the Secondary Side of Nuclear Steam Generators

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Investigation was conducted on solvents for removing magnetite, Cu and Cu oxides from deposits and sludges occurring on secondary side of nuclear steam generators. Results indicate that 2 step procedure involving 2 different solvents should be used. Solvent composed of 10% EDTA, 1% N2H4, 5 ml/l CCl-80/1 (non-proprietary corrosion inhibitor), pH 7.0 with NH3 used at 93°C will dissolve magnetite in reasonable time. Corrosion produced by solvent on materials of construction tested was reasonably low in all cases.Solvent composed of 5% EDTA, 2% H2O2 at (pH 7.0 (with ammonia)then 10.0 with EDTA) was developed to dissolve Cu and Cu oxides.Solvent is most effective when used at ambient temp.

Laboratory Studies of Formation of Intermetallic Layer in Tinplate

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Description of lab plating unit & flow melting unit simulating industrial tinplate line. Comments on intermetallic layer. Disc'n pp 144-146 with additional data.

Laboratory study of cathodic protection provided by 55% Al-Zn coating compared with galvanised coating

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Comparison of title aluminium - zinc alloy with pure zinc, both hot-dip galvanised reports corrosion potentials, galvanic couple voltages (in distilled water & 5% NaCl), also galvanic currents in a conductive sol'n. No simple conclusion is drawn and geometry of CP and type of environment appears at least as important as actual coating comp'n. 7 refs

Laboratory Study of Commercial Method of Plating onto Aluminium

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Study of Wallbank (q.v) process. Various Al alloys as substrates. Adhesion & its dependance on cleaning & plating stages (qualitative only). Several modif'ns of W. process examined. Disc'n pp 217-226.

Laboratory Study of Dry Sulphur Dioxide Deposition on Atmospheric Corrosion of Galvanised Steel

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Dry sulphur dioxide was deposited onto galvanised mild steel onto which dew was then deposited by spraying moisture of various pH values. From these short-term experiments, effects (corrosion damage) of dry SO2 dep'n are reported. Deposition of ammonium bisulphate is also studied.

Laboratory study on nicotinic acid silver pulse electroplating and deposit properties.

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The effects of process conditions on the deposition rate, appearance, adhesion strength, anti-tarnish property and surface morphology of the silver coating obtained from a nicotinic acid bath by pulse reverse plating were studied. Under optimal conditions, the above-mentioned process was compared with the butanedimide silver plating process. The results showed that bright deposit with good anti-tarnish property can be obtained by the given pulse reverse process at a current density of 0.25 A/dm*2, frequency 1 000 Hz and temperature 25°C. The deposit obtained from the nicotinic acid system has better performance than that obtained from the butanediimide system. The silver deposit is of cubic crystal system.

Laboratory Technique for Electrodeposition of Manganese on Other Metals

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Development of title bath is reported based on sulphate -citrate a divided cell with bagged carbon anodes. The deposit was alpha-Mn with hardness 550-725 DPN. Deposits soon tarnished to form a brown film and were found to offer cathodic protection to steel & Al. Disc'n pp 476-7.

Laboratory Techniques Tutorial: porosity measurements on coatings

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Test methods incl. chamber tests (salt spray, acetic acid CASS), saline droplet, Corrodkote, moist sulphur dioxide, nitric acid vapour, sulphur test, ferroxyl, water tests, copper electroplating ("decoration"), alizarin & electrochemical tests such as electrographic, field exposure & optical inspection are all briefly explained. Table lists substrate-coating combinations and recommended porosity tests. 28 refs

Laboratory test simulation of aluminium cold forming - influence from PVD tool coatings on the tendency to galling.

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Laboratory testing of anticorrosive paints

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Most methods described use inexpensive equipment and provide results within 1 week (max. 1 month). Tests are divided into those that examine coating, those that look at substrate, and those that study both. Tests on detached coatings include elec. measurements, leaching and permeability tests, permeability to gas/liquid/ions, and decoration of high permeability areas. Tests on metal substrate alone involve exposing specimens to practical environments, and leachate tests. Tests on both together incl. elec. tests and adhesion tests.

Laboratory testing of in-service performance parameters of internal pipe coatings

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Internal pipe coatings are often damaged by field operating conditions and handling procedures. Laboratory comparisons have shown that some internal coatings are surprisingly intolerant of wireline abrasion, rapid depressurization, and external pipe dents. Samples used for tests were supplied by applicators and are from typical production runs.

Laboratory testing of in-service performance parameters of internal pipe coatings

Relevancy:  

Internal pipe coatings are often damaged by field operating conditions and handling procedures. Laboratory comparisons have shown that some internal coatings are surprisingly intolerant of wireline abrasion, rapid depressurization, and external pipe dents. Samples used for tests were supplied by applicators and are from typical production runs.