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Salt Spray Testing of Tinplated Copper
Salt spray corr'n tests of tinplated Cu are reported as function of deposit thickness. The porosity of deposits is considered and results from several different cabinets are compared. 8 refs.
Salt spray tests
Parameters affecting salt spray testing were examined and guidelines are provided for rational use of salt spray testing.
Salt-free aqueous washing solutions for washing bearing components
Results of developing and studying salt-free aq. washing soln. as replacement for fire risk petroleum solvents and salt-contg. aq. soln. are given. It is shown that salt-free washing soln. based on flotation reagent provides means of providing physicochemical action of soln. and mechanical action of jet of liquid on contamination to be removed and ensure good quality cleaning of bearing components after mechanical finishing by washing in single stage without heating of washing soln. These properties of proposed soln. have great importance on automatic grinding and assembly lines for bearing production.
Salvaging High-value Aluminium Alloy Parts for the Aircraft & Aerospace Industries
Detailed history of aluminium anodising, esp. hard anodising, where variants of the process are detailed & compared.Stripping of anodise coatings and forming a proprietary salvage hard coating using organic additive are detailed. Dimensional changes can be compensated using thicker anodise coat and process allows expensive parts to be r-used, possibly more than once.
Salvaging Worn Parts
Note on salvaging worn engineering parts by building up with electrodep'n or flame spraying. Table shows pros and cons for each method. Diagram shows dimensions & stopping-off. 2 refs.
Salzgitter AG expands plant
Report with photos on expanded plant for hot-dip galvanising & coil coating.
SAM study on plasma sprayed ceramic coatings
SURF Scanning acoustic microscopy (SAM) is relatively new non-destructive technique, using sound to create visual images of variations in mechanical properties of samples that may be opaque optically. 150 MHz reflection type SAM was used to detect the defects of thermally sprayed ceramic coatings. Porosity-type defects in coatings can be detected nondestructively. Defects are revealed as white regions, and substrates as gray region in SAM images. Features of each white region corresponding to various defects are different too. 4 types of arrangement patterns of white regions are concluded based on many observations. Contrast mechanism of defects in SAM images are illustrated by calculating the reflection coefficient at interface of air and coating matrix.
Samarium doped cerium oxide thin films deposited by e-beam technique.
Samarium pretreatment for improved organic coating performance of steel & copper substrates
Aq. Sm-based conversion coating using the Sm sulphate, on metal or phosphated metal substrates was studied using X-ray & other methods, salt spray corrosion testing. Not only is corrosion resistance enhanced, but paint adhesion also improves. Morphology ^ thickness is reported, SEMs show surfaces. Performance of vinyl & acrylic paints & others is set out, in terms of ASTM standards D610 & D714 & D3359 for blistering & adhesion. Concluded that Sm-based coating was broadly equivalent to phosphating, while Sm after phosphating gave enhanced corrosion protection. 11 refs
Samarium sulphide thin films
Sm monosulphide film is produced by co-sputtering Sm monosulphide target with S:Sm ratio >1 in inert gas discharge.
Sample analysis & characterisation with GDOES
GDOES - glow discharge emission spectroscopy- is ideal for surface analysis & characterisation of steels, and coated steels, such as hot dip galvanised (where the barrier layer is of special interrest) or electrogalvanised zinc deposits where the state of the original steel surface is the main focus of interest. Minimal sample preparation is involved.
Sample preparation as key to valid analyses; Comparison of works methods vs. DIN-DEV
Sampling techniques for effluents from plating shops are critical in obtaining valid data. Report describes newly developed German DIN-DEV standard, discusses analytical techniques with choice of sealed ampoules (one per analysis) or use of reagents from bottles. Test numbers are listed for chromates, total chromium. copper, nickel, zinc, cyanide. Discussion of sample heating in oven or microwave and suitable containers. Histograms show reproducibility of effluent analyses, use of nitric acid & hydrogen peroxide (incl. in sealed tubes at 120°C). 9 refs
Sample preparation for metallographic analysis
Overview of main steps, esp. in metallographic examination, mainly of electronic components. Sample mounting, grinding, polishing, etching are described with tables detailing conditions for most important metals & alloys.
Sample preparation of coated steel
While the scanning electron microscope is an excellent tool for examination of surface coatings, correct sample preparation is crucial. Details are given, with examples based on phosphated or organic coated steel.
Sample preparation of InGaAsP/InP-based lasers for plan-view transmission electron microscopy using selective chemical thinning
JES Sample preparation method for transmission electron microscopy plan- views of InGaAsP/InP-based laser diodes based on selective chemical thinning is described. It is possible to prepare samples with > 50% of active InGaAsP stripe electron transparent. The method is fast, simple, reliable, and will not introduce crystal defects in sample. Examples for preparation of buried heterostructure laser diodes of bulk Fabry-Perot type are demonstrated. Technique is applicable to other types of laser diodes, such as multiquantum wells and distributed-feedback.