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Qualitative analysis of alloys by electrography

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Metals are anodically dissolved by application of a potential, and then react with a colorimetric reagent dropped onto the surface. Electrolytes & reagents are listed for most metals, incl. rhenium, rhodium, iridium, gold, platinum and the non-noble metals. 5 refs

Qualitative analysis of hydrogen concentration in DLC films by Raman spectroscopy.

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Qualitative and quantitative methods for analysis of parameters determining accuracy of electrochemical machining

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Qualitative assessment of oxide anticorrosion coatings

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Corrosion behaviour of steel with oxide coatings formed in hot water at 300°C or in steam; cd-potential curves; electrical characteristics of oxide films on steel; anodic and cathodic reactions in passivation of metallic surfaces; equilibrium potentials for formation of FeO, Fe3O4 and forms of Fe2O3; changes in cd and potential of oxidised steel specimens, activated locally during cathodic polarization; effect of polarization resistance of oxide films at 20°C (17.7, 73.3 and 520 kohm) on corrosion current at 300°C (2.5, 0.61 and 0.067 kmA/cm*2 respectively); etc., are considered.

Qualitative determination and removal of hexavalent chromium impurity in acid nickel plating bath.

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The source and harm of hexavalent chromium impurity on a copper-nickel-chromium plating production line were analyzed. Two qualitative methods for determination of hexavalent chromium in acid nickel plating bath were introduced. The mechanisms and main operation procedures of four methods for removal of hexavalent chromium impurity including sodium dithionite reduction, ferrous sulfate reduction, lead salt precipitation, and using ZS chromium-removing agent were described. The application of ZS chromium-removing agent is the most convenient, fast, and easy to operation, and the production can be resumed immediately after impurity treatment. It is pointed out that the best measure to eliminate hexavalent chromium impurity is to have a strict management in workshop.

Qualitative determination and removal of nitrate impurity in acid nickel plating bath.

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Deleterious effects and sources of nitrate impurity in acid nickel plating bath were described. The qualitative determination of nitrate in acid nickel plating bath by using diphenylamine or by Hull cell test were introduced. Two methods for removal of nitrate impurities including electrolytic reduction and chemical reduction by using sodium bisulfite or sodium metabisulfite were presented. Electrolytic reduction requires a lot of work, wastes time, and is inconvenient in pH adjustment. Chemical reduction has advantages of slight effect on brighteners, short treatment time, and less loss of plating bath.

Qualities and Electrodeposition Behavior of Corrosion-Resistant Electrogalvanized Steel

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Disc'n of corrosion resistance, adhesion of paint coating, deposition mechanism. Beneficial effects of trivalent chromium or cobalt are noted. Graphs show cross-sectional deposit compositions, effect of near-cathode pH and the extent to which individual metals in the alloy are released in corrosion

Quality assurance in metal finishing. Pt 2. Zinc plating

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General comments on zinc plating, process monitoring & control with benefits of automated dosing to avoid see-sawing of concentration levels. Disc'n on sources of foreign metal contaminants, achieving good metal distribution and use of zinc dissolution cell to add zinc (as ions) to electrolyte. Graphs show cathode efficiency vs. current density for a sodium and potassium zincate bath. 13 refs

Quality control

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Comment on statistical sampling and its expression in various Standards, then discusses older and newer Standards, in which the latter better recognise the importance of sampling. A website is given where MIL Standards can be downloaded (http://dodssp.daps.mil).

Quality & Cost Improvement in the Aluminium Bright Anodising Process IV: Trouble Shooting

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A trouble-shooting guide to title process lists operating ranges for each step in the process sequence, summarises common faults and lists remedial actions. 36 refs. Disc'n Vol 54. p 398.

Quality & Filtering

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Comment, with no data on types of filtration equipment and their advantages and drawbacks.

Quality & process control in zinc nickel alloy electrodeposition

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Zinc-nickel & zinc-iron alloys can provide necessary attributes for automotive application, only if the process is tightly controlled. Graph shows current efficiency vs. solution depletion for 10, 12 & 15% nickel alloy deposits. Table compares 3 different alloy plating systems as used in barrel plating, showing cost(DM/kg) ranging from 0.65 to 0.42. Some 15 parameters are itemised. Comments on bath replenishment methods. Factors affecting bottom-line costs are identified and a valid approach to comparing different processes is detailed.

Quality & Surface Roughness in Mass Finishing - Part 1.

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Concept of surface roughness in relation to coating thickness is introduced, with comment on levelling & non-levelling solutions.

Quality - an industry wide concern

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Focus on barrel plating, esp. of screws, bolts, other fasteners, problems with lead containing steel such as 12L14. The concept of "directional" and "non-directional" defects is explained, also describable as random or systematic. Comments of defects & failures in chromium plated automotive trim where location on the vehicle can be important, with small stones etc initiating Cr cracking.

Quality - smoke and mirrors or a reality in your plating job shop - ISO 900, Part IV

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Discusses control of nonconforming product. handling, storage, packing and delivery, quality records, internal quality audits, training, servicing, statistical training, relevance of ISO 9002 and TQM.