Materials Performance Supplements


Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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TABLE 1. ADDITIVE ANALYSIS Element EP Additive 1 (wt%) EP Additive 2 (wt%) Ash 0.007 2.27 Oxygen 54.26 53.71 Sodium 1.96 — Aluminum — 1.16 Silicon 38.47 9.34 Phosphorus 4.69 31.01 Potassium 0.62 1.28 Zinc — 3.48 TABLE 2. PHYSICAL-CHEMICAL PROPERTIES OF VCI-1 AND VCI-1L Test VCI-1 VCI-1L Appearance Clear yellowish to amber liquid Clear yellowish to amber liquid pH 9-8 (1% in water) 7.5-8.5 (1% in water) Density 8.5-8.7 lb/gal (1.03-1.06 kg/L) 8.6-8.8 lb/gal (1.03-1.06 kg/L) Non-Volatile Content 50-60% 60-70% TABLE 3. PHYSICAL-CHEMICAL PROPERTIES OF VCI-2 Appearance Brown viscous liquid Density 0.91-0.96 kg/L Non-Volatile Content 91-97% Th e compon ents of th e formulat ed additive were tested according to the North Sea (United Kingdom, Norway, Denmark, and The Netherlands) regulations to satisfy the criteria: • Biodegradability : >60% in 28 days • Marine toxicity: Effective concentration 50% (EC50)/lethal concentration 50% (LC50) >10 mg/L to North Sea species • Bioaccumulation: Log octanol/water partition coefficient <3 Performance Tests Per formanc e t e stin g for V C I-1 and VCI-1L included the following tests. Compatibility with Seawater Test This test was performed as follows: Hydraulic fluid samples with added 10% arti- ficial seawater were subjected to cycling for 16 h at 80 °C and 8 h at 7 °C. Samples were subjected to seven cycles and then inspected visually for any changes. IP 287 Cast Iron Chip Corrosion Test4 This test was performed as follows: The dilution of samples of hydraulic fluids with 10% and 25% of artificial seawater were pre- pared. Cast iron chips were placed on filter paper and wetted with a sample of hydraulic fluid. The area of paper stained with corro- sion was recorded after 2 h. Vapor Corrosion Inhibition Test This was evaluated according to ASTM D5534,5 "Standard Test Method for Vapor- Phase Rust-Preventing Characteristics of Hydraulic Fluids." This test method evalu- ates the ability of hydraulic fluids to prevent the rusting of steel in the vapor phase over the hydraulic f luid and water. A sample of the fluid was placed into the testing beaker. The beaker was heated to the temperature of 60 °C and then sealed with the lid, with an attached carbon steel (CS) plug (coupon) inside. The plug was evaluated for the pres- ence of rust after 6 h of testing. Multi-Metal Vapor Corrosion Test T h i s t e s t w a s p e r f o r m e d o n U N S G10180 CS (SAE 1018) and copper. In this test, hydraulic f luid with the added corro- sion inhibitor was heated to 60 °C in a wide neck conical f lask. The metal panel was placed over the mouth to stand for 15 min. After that, the panel was visually inspected for the presence of corrosion. Anti-Wear Properties Test Anti-wear properties of the corrosion inhibitor formulation were tested (only VCI-1L2) using a Falex † lubricant tester with 2 V-block made from UNS G11370 (AISI 1137) steel and brass pin.6 The target torque and anti-wear properties of the final fluid were as follows: • 15 lb·in (1.69 N*m) at a load of 500 lb (227 kg) for 1 min • < 20 lb·in (2.26 N*m) at load of 500 lb (227 kg) for 30 min • Wear teeth = 5 or less Corrosion Inhibitor for Mineral/Synthetic Oil-Based Hydraulic Fluids (VCI-2) A vapor corrosion inhibiting additive for oil-based hydraulic fluids formula is an oil-soluble blend of calcium sulfonate and amino-carboxylates in synthetic oil. Its physi- cal-chemical properties are shown in Table 3. The VCI additive was tested in hydraulic oil with physical-chemical characteristics conforming to ISO Grade 32.Testing proce- dures of ISO 32 hydraulic oil with and with- out VCI-2 included the following procedures: • Water Separability (ASTM D14017). This test method evaluates the ability of fluids to separate from water. Equal volumes of fluid and deionized water were mixed and placed in a graduated cylinder. The method evaluates the sep- arated volume of fluid and water at the recommended temperature after several time intervals after mixing. Volumes are reported as oil/water/emulsion. • Copper Strip Corrosion (ASTM D1308). This test evaluates the relative degree of fluid corrosivity to copper. A copper † Trade name. 5 CORTEC SUPPLEMENT TO MP MATERIALS PERFORMANCE JUNE 2016

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