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Vapor phase corrosion inhibitors and method for their production

一种腐蚀抑制、物质的技术，应用在化学仪器和方法、防腐涂料、其他化学过程等方向，能够解决VCI腐蚀防护损害等问题

Inactive Publication Date: 2012-09-05
EXCOR KORROSIONSFORSCHUNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the use of this packaging material in spaces with higher relative air humidity and, in the case of copper-based materials, damage to the corrosion protection of the VCI is not excluded

Method used

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  • Vapor phase corrosion inhibitors and method for their production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The following composition of matter VCI (1) according to the invention was prepared from an anhydrous substance:

[0072] 20.0% caprylic acid by weight

[0073] 15.0 wt% 2,4-Hexadienoic acid

[0074] 15.0% by weight adipic acid

[0075] 10.0% by weight 2-aminobenzamide

[0076] 5.0% by weight 5,6-dimethylbenzimidazole

[0077] 35.0% by weight inert filler (silica gel)

[0078] In each case, 5 g of this mixture were distributed widely on the bottom of a 25 ml glass beaker placed in a glass bottle (capacity 1 liter). Next to this glass beaker, position a second glass beaker containing 10 mL of deionized water. Then put it into the sample holder, and position the four cleaned samples on the sample holder with an inclination of 45° relative to the horizontal. The samples consisted in each batch of materials low-alloy steel 100Cr6, cast iron GGG25, AlMg1SiCu and Cu-SF without oxidation tints and deposits.

[0079] The glass vials containing the metal sample, deionized...

Embodiment 2

[0091] The following compositions of matter according to the invention were prepared from an anhydrous substance:

[0092] 25.0% caprylic acid by weight

[0093] 15.0 wt% 2,4-Hexadienoic acid

[0094] 15.0% by weight adipic acid

[0095] 5.0% by weight methylparaben

[0096] 15.0% Niacinamide by weight

[0097] 2.5% by weight 5,6-dimethylbenzimidazole

[0098] 21.5% by weight potassium hydroxide

[0099] 1.0% by weight 250GR (hydroxyethylcellulose, dispersing aid, thickener) and therefrom a dispersion was prepared at a concentration of 25% by adding deionized water.

[0100] With this preparation coating paper web (kraft paper 70g / m 2 ), of which 15g / m 2 wet application. Immediately after air drying the VCI paper VCI (2) according to the invention produced in this way was tested for its corrosion protection effect compared to a commercially available corrosion protection paper used as a reference system (R2). According to chemical analysis, the reference system (R2)...

Embodiment 3

[0109] 12.7% caprylic acid by weight

[0110] 8.6% by weight nonanoic acid

[0111] 11.2% by weight sebacic acid

[0112] 11.2% by weight 4-aminobenzamide

[0113] 6.8% by weight methylparaben

[0114] 14.1% by weight sodium caprylate

[0115] 14.3% by weight silicic acid

[0116] 6.3% by weight Silicate (anti-caking additive)

[0117] 8.1% by weight calcium carbonate

[0118] 6.7% by weight B215 (stabilizer)

[0119] 26.5% by weight of this mixture was mixed with 73.5% by weight of EBA (ethylene / butyl acrylate copolymer) and processed into a VCI masterbatch. For this, a laboratory extrusion device Rheocord 90 (HAAKE) with co-rotating twin-screw extruders was used. The mixture was extruded at a screw speed of 65 to 80 rpm, at a cylinder temperature of 110 to 135°C and a nozzle temperature of 135°C, and pelletized by cold cutting. The pelletized VCI masterbatch was further processed into VCI films by extrusion blown film forming, for which a laboratory extrusion unit...

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Abstract

The present invention relates to new substance combinations as vapor phase corrosion inhibitors for protecting a broad range of customary utility metals, including iron, chromium, nickel, tin, zinc, aluminum, copper, magnesium and their alloys, against corrosion in humid climates. Said substance combinations comprise (1) at least one C6 to C10 aliphatic monocarboxylic acid, (2) at least one C6 toC10 aliphatic dicarboxylic acid, and (3) a primary aromatic amide. Preferably they further comprise (4) an aliphatic ester of hydroxybenzoic acid, in particular of 4-hydroxybenzoic acid, and / or (5) a bemzimidazole, in particular a benzimidazole substituted on the benzene ring.

Description

technical field [0001] The present invention relates to compositions of matter as vapor phase corrosion inhibitors (evaporable or sublimable corrosion inhibitors, vapor phase corrosion inhibitors VPCI, volatile corrosion inhibitors VCI) for protection against common practical metals such as iron, chromium, Nickel, tin, zinc, aluminum, copper, magnesium and their alloys corrode in humid climates. Background technique [0002] Corrosion inhibitors have been used for decades, which tend to evaporate or sublimate even under standard conditions and thus reach the metal surfaces to be protected via the gas phase, for use in enclosed spaces, e.g. in packaging, switch cabinets or display cases Temporary corrosion protection of metal objects. Protecting metal parts against corrosion during storage and transport in this way is a cleaner alternative to temporary corrosion protection with oils, greases or waxes and becomes more meaningful as the globalization of national economies incr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/02
CPCB32B27/18C23F11/02B65B55/19B65D81/26C09D5/08C23F11/126C23F11/149C23F11/187C09K2105/00
Inventor G·赖因哈德U·路德维希G·哈恩
Owner EXCOR KORROSIONSFORSCHUNG
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