Methods for applying sacrificial coatings for corrosion protection of steel chains and chains prepared thereby

Patent metadata

Field	Value
Publication number	US-9453276-B2
Application number	US-201514968988-A
Country	US
Kind code	B2
Filing date	Dec 15, 2015
Priority date	Dec 18, 2014
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

Processes for protecting steel chains from corrosion and steel chains thus protected are provided. The process includes using finite element analysis to determine stress levels within links of a steel chain having a plurality of connected links. Regions of each link of the chain corresponding to high stress levels are identified. Target areas corresponding to the regions identified are indicated for coating each link of the chain with a sacrificial coating. Thermally sprayed alumina can be used as the sacrificial coating.

First claim

What is claimed is:

1. A process for protecting a steel chain from corrosion, comprising:
a. using finite element analysis to determine stress levels within links of a steel chain comprising a plurality of connected links;
b. identifying regions of each link of the chain corresponding to high stress levels;
c. indicating target areas for coating each link of the chain corresponding to the regions identified; and
d. applying a sacrificial coating to the target areas;
wherein each link comprises a crown at each end of the link, two interior shoulders at each end of the link and a weld; and wherein the target areas for coating each link of the chain corresponding to the regions identified comprise areas of the link selected from the group consisting of each crown of the link, each interior shoulder of the link, the weld of the link and combinations thereof.

2. The process of claim 1 , wherein the sacrificial coating comprises a metal selected from the group consisting of aluminum, zinc, magnesium and alloys thereof.

3. The process of claim 1 , wherein the sacrificial coating is applied by thermal spraying.

4. The process of claim 1 , wherein the sacrificial coating is applied during a process for inspection of the steel chain.

5. The process of claim 1 , wherein the sacrificial coating on each link covers from 5% to 95% of the surface area of the link.

6. The process of claim 1 , wherein the sacrificial coating on each link has a thickness from 0.10 to 1.0 mm.

7. The process of claim 1 , wherein the sacrificial coating on each link has a thickness from 0.15 to 0.30 mm.

8. The process of claim 1 , wherein the sacrificial coating comprises a composition selected from the group consisting of metals, alloys, ceramics, thermoplastic polymers, composites and combinations thereof.

9. The process of claim 1 , wherein the links of steel chain comprise carbon steel.

Assignees

• Chevron Usa Inc

Inventors

• Ma Kai-Tung
• Witt Devin Lee
• Mishael Samuel Jay
• Akinpelu Adebayo Olakunle
• Gonzalez Ariel Alexander

Classifications

• C23C4/12

  characterised by the method of spraying · CPC title

• F16G13/04

  Toothed chains · CPC title

• F16G13/06

  with links connected by parallel driving-pins with or without rollers {so-called open links} · CPC title

• F16G13/12

  Hauling- or hoisting-chains {so called ornamental chains} · CPC title

• F16G15/12

  Chain links · CPC title