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A Black Epoxy-Polyurethane Cathodic Electrophoretic Coating.
Three kinds of blocked polyisocyanate curing agents were synthesized and their film appearances compared. The deblocking temperature of various blocking agents and its influence on films performance was studied. The influence of factors of different ratios between curing agent and modified epoxy resin, pigment and basic material, and various dispersants on films performance was discussed. A kind of epoxy-polyurethane cathodic electrophoretic lacquer coating with low curing temperature, hardness of 3 ~ 4 H, adhesion of 1 grade and excellent corrosion resistance performance was gained by low-temperature de-blocking technique of blocked polyisocyanate crosslinking agent on the basis of the optimized dosage of m (curing agent) : m (modified epoxy resin) = 1 : 4 ~ 5, m (pigment) : m (basic material) = 0.24 : 1 and using 4,560 wetting dispersant.
A "Black box" for Paint Stripping Baths
Filter unit with exchange function which is returned to the stripper solution supplier. Flowsheet, photos explain concept.
A "New" Pretreatment for Filiform Corrosion
Use of yellow chromates as basis for painting of aluminium is questioned on environmental & health & safety grounds. Results are shown (DIN 65 472) for filiform corrosion resistance on AlMg1 of MBV (Modified Bauer Vogel process), chromated, zirconium oxide & ALROK. Also used were zincate & electrochemical anodic oxidation using d.c in sulphuric acid or in chromic or phosphoric acids. Graphs show results in terms of length of filiform fibres & their frequency. Results of other tests are given - boiling water, impact tests, bend tests &condensed water test. Anodic oxidation gave best results. 3 refs.
A "True" Water Based Paint
A paint manufacturer (Schwaab Paints) extols the properties of their new water based system with details of its application. Tables show its performance in terms of DIN standards (corrosion) and its physical properties (hardness, adhesion) as well as resistance to oil, petrol, hot water. Effluent problems are saidto be no worse, possibly lighter than with conventional solvent paints. 10 refs.
A 3-D approach to finishing
Describes nature and applications of coated abrasives in electronics, aerospace, metal working and automotive industries. 3-D abrasives (Freudenberg Nonwovens Ltd., Abrasives Dept., PO Box 3, Greetland, Halifax, W. Yorks. HX4 8NJ) comprise synthetic fibres, abrasive grits and resins combined into non-woven material.
A 3D EHL Simulation of CMP Theoretical Framework of Modelling.
A 3D FE model with plastic shot for evaluation of equi-biaxial peening residual stress due to multi-impacts.
A 3D simulation of two-phase flow in an effervescent atomizer for suspension plasma spray.
SURF This issue is Proceedings of 2nd International Workshop on Solution & Suspension Thermal Spraying, 5-7 June 2008, France. Search Vol. & issue for all papers.
A bar deburring plant.
Mechanism for aligning and feeding cut lengths to brushing heads.
A basic calcium and magnesium product.
In a process for the production of a reaction product, consisting mainly of basic calcium and magnesium compounds, from lime-containing and magnesia-containing minerals, preferably for use in water treatment, carbonate minerals such as, for example, dolomite, dolomitic limestone and calcareous magnesite, mixed if desired with calcium oxide, are heated, preferably in a double-drum rotary furnace under such conditions that carbon dioxide is split off completely from the magnesia compounds of the minerals but the calcium carbonate is only partially decomposed; the carbon dioxide is withdrawn from the heating zone at substantially the same rate as it is evolved by the heating minerals: the heated material is passed into a working zone into which some or all of the carbon dioxide withdrawn from the heating zone is also passed, and is there cooled in the presence of the carbon dioxide, whereby the calcium oxide produced by the partial decomposition of calcium carbonate and any calcium oxide admixed with the minerals are recarbonated. The recarbonated product may be hydrated, for which purpose bicarbonate-containing or lime saturated water and free carbon dioxide are preferably used. The product may be used in the treatment of water (see Group I) or as a carrier for metallic salts having an oligodynamic action. The product may undergo hydration and further carbonation by the action of bicarbonate-containing or lime-saturated water and carbon dioxide. Specifications 498,372 and 668,755 are referred to.ALSO:In a process for the production of a reaction product, consisting mainly of base calcium and magnesium compounds, from lime-containing and magnesia-containing minerals, preferably for use in water treatment, carbonate minerals such as, for example, dolomite, dolomitic limestone, and calcareous magnesite, mixed if desired with calcium oxide, are heated in a heating zone, preferably in a double-drum rotary furnace, under such conditions that carbon dioxide is split off completely from the magnesia compounds of the minerals but the calcium carbonate is only partially decomposed; the carbon dioxide is withdrawn from the heating zone at substantially the same rate as it is resolved by the heating minerals; the heated material is passed into a cooling zone into which some or all of the carbon dioxide withdrawn from the heating zone is also passed, and is there cooled in the presence of the carbon dioxide, whereby the calcium oxide produced by the partial decomposition of calcium carbonate and any calcium oxide admixed with the minerals are recarbonated. The recarbonated product may be hydrated and further carbonated for which purpose bicarbonate-containing or lime-saturated water and free carbon dioxide are preferably used. The product is preferably used in granulated form as a filtering means for the de-aciditation of water, for the removal therefrom of iron or manganese, or in the form of an aqueous slurry as a precipitating or clarifying agent. The product may undergo hydration and further carbonation by the action of bicarbonate-containing or lime-saturated water and carbon dioxide, in which case a skin of precipitated calcium carbonate forms on the product. This skin is sparingly soluble in water and ensures that the water treated is not made too alkaline. The reaction product may be used as a carrier for metallic salts having an hydrodynamic action or may be used with chlorine compounds, with salts yielding up, or containing with oxygen, or with phosphate compounds, in the latter case for conditioning boiler feed water. Water chlorinated in excess when passed through the product has the excess chlorine removed. Oxygen or chlorine may be removed from aqueous solutions by embedding suitable metals in the reaction product whereby on contact of the product with water electric potential differences are set up to effect the desired removal. Specifications 498,372 and 668,755 are referred to.
A bath contamination accident in nickel plating
A Bath for the Elecrodeposition of Bright Zinc-Nickel.
98: 224146 The addn. of piperonal and Na lignosulfonate to a chloride/sulfate bath allows the electroplating of alloys contg. 10-20% Ni.. This deposit resembles Cd in appearance as well as in corrosion resistance and offers better hardness and corrosion protection than pure Zn. This electroplate can act as a substitute for Cd which is poisonous and more expensive.
A better heavy metal waste treatment method
Reaction pH and reduction chemical can drastically affect sludge volume generated by Cr reduction and pptn. Na2S and Fe(II) chloride can rapidly reduce Cr(VI) at pH 8 and produce c. 1/4 sludge produced by standard acidic reactions using only Fe(II) sulphide. Mechanism involves catalytic oxidation of sulphide to sulphate. Chemical costs are less since acidification step is omitted, and NaOH required to raise pH to pptn. levels is less.
A better understanding of PEO on magnesium alloys by using a simple galvanostatic electrical regime in a KOH-KF-Na3PO4 electrolyte
SURF AZ91 Mg alloys were anodized by PEO under galvanostatic regime in order to evaluate the role of the different constituents of a KOH + KF + Na3PO4 containing electrolytic bath. The morphology of the anodized coatings was observed by scanning electron microscopy and the composition was evaluated by energy dispersive X-ray spectroscopy. The corrosion resistance of the grown films was studied by electrochemical methods such as impedance spectroscopy, voltammetry and chronoamperometry. It was shown that 10 min anodizing is sufficient to grow a protective layer by PEO under galvanostatic conditions (10 mA cm- 2), with a relatively low voltage (50 to 70 V). Fluoride anions act as "sparking initiators" in KOH electrolyte. So a threshold content of fluoride anions (0.2 M) is necessary to form an initial insulating layer and therefore reach the sparking phenomenon. Then, the addition of phosphate anions to a KOH/fluorides electrolyte allows the "sealing" or "the densification" of the coating, and promotes the growth of thicker films, without increasing the corrosion resistance of the coating.