Throwing Power of Electropainting

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  • 電着塗装のつきまわり性
  • デンチャク トソウ ノ ツキマワリ セイ

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The tube penetration method has been studied, and an equation was derived from which the length of strip coated can be calculated.<BR>A maleinized-oil type resin pigmented with carbon black and strontium chromate was neutralized with an amine, and was diluted with deionized water to 8 % solids to be used as a model paint. The current-time curve obtained when an 1. 75 cm diameter steel pipe was electrocoated at 100 V in a 10 cm diameter, 30 cm high stainlesssteel electrophoretic coating bath was the sum of two current-time curves obtained when the outside or inside of the tube to be coated was sealed. This suggested that the deposition inside the tube takes place independent of the deposition outside the tube. A 16 × 33 × O.3 mm steel strip was inserted into an 1.8 cm diameter glass tube and was electrocoated. The current passing through a small anode attached on the strip was measured. As the distance of the small anode from the glass tube exist was increased from 10 to 15 cm, the current peak site was shifted from 16 to 42 sec. When 100 V was applied to the strip for 15 sec, the length of strip coated was 10 cm.<BR>Partly based on these experimental results the equation, <BR>Th2= (a/L) (R/ρ) = (ρ/L) (E/ρ) <BR>has been derived, where Th is the length of strip coated (cm), a the area of glass tube cross section (cm2), L the distance round the strip (cm), ρ the specific resistance of the paint (Ω cm), R is equal to Eli, i the current density (A/cm2) measured on the strip surface at the end of deposition, and E the voltage applied. Varidity of the equation was confirmed by using a series of strips of 30 × 1.83 × O.03 to 30 × 0.27× 0.03 cm inserted in glass tubes of a = 2.86 cm2, and also by using a series of glass tubes of a=1.37 to O.39 cm2 with the inserted strips of L=1.46 cm, and finally by changing the paint concentration from 16 % down to 1 %, ; in order to change 1/ρ from 300 to 3400 μU/cm.

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