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Quality Assurance criteria for technical vitreous enamelled castings: preconditions for certification
Focus on water and gas supplies, large scale valves, hydrants, T-junctions etc. The range of products is reviewed. SEM shows metallographic cross-section with comments on features. The DEV quality guidelines and test procedures are summarised, incl. visual inspection, coating thickness, surface inspection for defects, pores etc (metallographic crposs-section shown), impact resistance, hardness, thermal shock, water immersion (corrosion), acid resistance, sub-surface rusting etc, UV resistance, and corrosion after various forms of impact etc. Image compares performance of vitreous enamel vs. other organic coatings in most atmosphere with UV. 3 refs
Quality Assurance during Thermal Spray Coating by Means of Computer Processing or Encoding of Digital Images.
Thermal spray coating method for creating a coating layer on a surface of a substrate is monitored by determining characteristics of the thermal spray coating as it affects the quality of the coating layer by recording, controlling, and monitoring through a digital camera whose image is analyzed and characterized.
Quality assurance for coatings, paintwork & related surfaces
Thorough & detailed guide to the various steps involved in ISO 9000 series certification, with details of practical aspects & generation of necessary paperwork.
Quality assurance for powder coating & wet painting
Qualicoat is European quality mark for paint & powder coating of architectural aluminium. EMPA is the validating body for this. Structural diagram shows hierarchy, ESTAL, Qualisurfal, Qualanod and Qualicoat. Below these levels, national groupings and individual firms are located. with EMPA as test facility. Second structural diagram links coating mfr with coater, EMPA is again involved. The actual guidelines are set out and the self-assessment procedures. Coated products and the coating organisation itself are monitored. Individual tests are discussed, in particular cross-hatch test, explaining how different depths of cut can be selected to test different aspects. Also the indentation test, the cupping test to test for cracking during gradual deformation, the mandrel bend test and impact test. Under-coating rusting test is also detailed. Discussion on significance of tests and interpretation of results.
Quality assurance in cleaning metal surfaces
Problems are discussed concerned with strong variations in cleaning solns. in various types of cleaning plant for engine components. Methods of maintaining opt. concns. ranges are considered.
Quality Assurance in Copper Electroplating
The incidence of defects in copper plating (e.g of p.c.b's) can be greatly reduced by using baths with organic additives. The effects of variation of conc'n of wetting & levelling agents on bright Cu are shown. The question of analytical methods is raised. HPLC (high pressure liquid chromatography) and CVS (cyclic voltammetric stripping) are discussed and compared as methods. Alternatives (incl. Hull cell and other indirect methods) are briefly considered. The use of HPLC or CVS for continuous bath monitoring is shown with graphs plotting bath history over 6 weeks. 5 refs.
Quality Assurance in Drilling of Multilayer Printed Circuit Boards
Description of proprietary system where camera is linked to computer and test samples can be run to check registration. Histogram shows how defect rate or yield are improved.
Quality Assurance in Electroplating - The Basis of a Modern System
Systematic approach to QA with random examples of failed work and examples of specifications for extreme exposure components assessed with DIN tests e.g 50018, 50021. 12 refs.
Quality assurance in hard anodic oxidation of aluminium
Quality assurance system is described for hard anodizing of Al with reference to tests for coating thickness (DIN 50984, ISO 2360), hardness (DIN 50133), micro-section test (DIN 50943, ISO 1463), roughness (DIN 4768), corrosion (DIN 50017, 50018, 50021), metal removal (DIN 50988, ISO 3210), abrasion (MIL 8659D) as well as dimensional and tolerance measurements.
Quality assurance in hard anodizing of aluminium
Discusses test methods for hard anodized coatings with special reference to statistical process control. Emphasis is given to alloy composition and structure.
Quality Assurance in p.c.b Production using Recycled Complexing Agents
Using a newly-developed electrolytic cell, 95% of EDTA and similar complexants could be recycled in electroless copper plating of p.c.b's. Micrographs of good and bad cross-sections are shown, decomp'n reactions of EDTA are given and typical impurity conc'ns in as-delivered EDTA plotted. Mixed pot'l-time graph is shown and effects on resistivity & ductility plotted, Process flowsheet of re-cycling cell is shown with operating data for the cell. 4 refs
Quality Assurance in Plating Shops with Automatic Process Monitoring
Description of commercially available system which logs main parameters. These can then be used to produce documentation. Screen displays are shown.
Quality assurance in production
Quality Assurance in small plating shops
Paper is largely based on ASTM B733 and MIL-I-45208A standards. Brief historical comments going back to Kanigen process. Emphasises importance of making sure what it is that customer requires. Lists tasks associated with daily replenishment pump. Sample documents are shown, incl. various check lists. The creation of a QA manual is discussed and examples incl. contents pages are shown.. Plant layout & building scheme are also included.
Quality assurance in surface finishing using optical test methods
Review of methods incl. surface roughness & topography (characterisation). Photo show typical examples. Characterisation of substrates & coatings, e.g eith XRD, XRF, spectroscopy, ellipsometry and FTIR. Examples incl. titanium nitride, zinc-nickel coating on steel, chromium on glass, carbon on steel, ellipsometry examples. 17 refs