Salt spray test chamber requirements for different standards for salt solution
The salt solution is a key element of the salt spray test chamber test and plays a decisive role in the damage of the sample. The requirements for salt solutions are mainly: 1) Salt solution preparation materials - water and sodium chloride requirements; 2) the concentration of the salt solution; 3) the pH of the salt solution; There are different requirements for salt spray test salt solutions in different standards of salt spray test chamber, see the following table: project GJB150.11 GJB150.11A GB/T2423.17 GB/T2423.18 GB/T10125 GB/T1771 ASTM B117 water Distilled or deionized water with a resistivity of not less than 50,000 Ω·cm The resistivity is 1500~2500Ω·m Distilled or deionized water Distilled or deionized water with a resistivity of 20 μS / cm GB/T6682 tertiary water (conductivity ≤0.5Ms/m) ASTM D1193 four-stage water (conductivity ≤5.0μS/cm) Sodium chloride Chemically pure w(Nal)≤0.1% Total impurity ≤0.5% w(Nal)≤0.1% Total impurity ≤0.3% Chemically pure w(Nal)≥99.5%, w(Nal)≤0.1%, basically free of Cu, Ni Halides other than Cl ≤ 0.1%, total impurities ≤ 0.3%, w (Cu) < 3 × 10 (-6th power) Quality score 5% ± 1% - 5% ± 1% Concentration - (50±5)g/L (50±5)g/L - pH (35 ± 2) °C is 6.5 ~ 7.2 (20±2) °C is 6.5~7.2 6.5~7.2 (35 ± 2) °C is 6.5 ~ 7.2 Note: 1. GB/T6682 three-stage water requirement, pH is 5.0-7.5, conductivity ≤0.5mS/m, oxidizable substance (in O) <0.4mg/L, (105°C±2°C), evaporation Residue ≤ 2.0 mg / L. 2. ASTM D1193 four-stage water requirement, pH 5-8 at 25 °C, maximum resistivity 5.0 μS/cm, maximum water resistivity 2000 Ω•m, maximum sodium content 50 μg/L. 3. The sodium chloride solution having a relative density of 1.0255 to 1.0400 at 25 ° C satisfies the requirement of (50 ± 5) g / L or 5% ± 1%. Retractable Pen,Retractable Ball Pen,Retractable Gel Pens,Gel Ocity Pens Tonglu shangmei pen industry co.,ltd , https://www.shangmeipenindustry.com